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What is the difference between pottery, ceramics, porcelain and china?
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Pottery
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Pottery is, like ceramic, a very generic term. It is generally used to refer to items made from common clays. It is often but not exclusively handmade by the artisan, or craftsperson using their hands, molds, or a potter's wheel. It is generally fired at lower temperatures, sometimes as low as 800 degrees. It is also called earthenware, stoneware and graniteware among others. Earthenware may sometimes be as thin as bone china and other porcelains, though it is not translucent and is more easily chipped. Earthenware is also less strong, less tough, and more porous than stoneware - but its low cost and easier working compensate for these deficiencies. Due to its higher porosity, earthenware must usually be glazed in order to be watertight.
CERAMICS
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The word ceramic is derived from the Greek word κεραμικός (keramos). The term covers inorganic non-metallic materials which are formed by the action of heat. Up until the 1950s or so, the most important of these were the traditional clays, made into pottery, bricks, tiles and the like, along with cements and glass. Clay-based ceramics are described in the article on pottery. A composite material of ceramic and metal is known as cermet. The word ceramic can be an adjective, and can also be used as a noun to refer to a ceramic material, or a product of ceramic manufacture. Ceramics may also be used as a singular noun referring to the art of making things out of ceramic materials. The technology of manufacturing and usage of ceramic materials is part of the field of ceramic engineering.
China
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The Chinese perfected porcelain by using kaolin (a white clay formed from feldspar granite and pegmatite and remains white when fired), mixing it with china stone 'petuntse' (like kaolin, with the feldspar less decomposed which fused it into a kind of glass when fired at high temperatures).
The petuntse was mixed with 'kaolin' and held it together. The Chinese called the 'Kaolin' the bones of the porcelain and the petuntse as the flesh.
;That was in the 10th century and it took another 800 years before true porcelain was developed in Europe.
'China', in this context, originally refered to a ceramic dinnerware coming out of the country of China which was particularly fine and exceptionally white.
NOTE: It should be mentioned here that many 'china' products or 'chinaware' actually came from Japan and even Korea! It was still called 'chinaware' though. Once Europe developed the techniques of making 'China' everything made this way was called 'China'. This included practically everything made of clay including some very crude pottery items.
It had a standard of quality unknown elsewhere at the time. Of course, with everyone demanding this amazing product it was inevitable that it would be copied. That is when things get complicated! Since the basic ingredients of 'china' were not always available in the countries which tried to duplicate it, various ingenious ways were introduced to get a piece of this lucrative market. These items were initially called 'chinawares'; but potters, of course, had to one-up the competition and called it anything which would indicate better quality or durabilty. To complicate things even more for today's collector, later studies, books and papers gave other names to some of these items and you get names like 'soft paste' 'hard paste', 'porcelain' , 'iron stone', 'cream ware' , and many more.
That just refers to the clay body or process which contains the shape of the item. There are hundreds of names given to items depending on the way they were decorated and/or finished.
The glazing process alone has numerous names associated with it such as; 'underglaze' and 'overglaze' and then there are the numerous ways to enhance items such as incising,embossing and more.
Then too, some are named for the country or region in which they originated or became perfected or for the potter who invented the process. So names are a confusing way to identify 'china' and many refer to the same process basically.
Please refer to further FAQ for some of these.
PORCELAIN
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Porcelain comes from the Portugese word "porcellana" which refered to a cowrie shell. It is typically used for the most delicate and shell-like pieces of china which originally came from China. Typically today porcelain is referred to as the white hard paste (clay) made from Kaolin and 'Petuntse' clay.
It is a ceramic material made by heating raw materials, often including clay in the form of kaolin, to high temperatures in a kiln at temperatures between 1,200 °C (2,192 °F) and 1,400 °C (2,552 °F). The toughness, strength, and translucence of porcelain arise mainly from the formation of glass and the mineral mullite within the fired body at these high temperatures .
For the purposes of trade, the Combined Nomenclature of the European Communities defines porcelain as being "completely vitrified, hard, impermeable (even before glazing), white or artificially coloured, translucent (except when of considerable thickness) and resonant." However, the term porcelain lacks a universally agreed definition and has "been applied in a very unsystematic fashion to substances of diverse kinds which have only certain surface-qualities in common" (Burton 1906).
Porcelain was named after its resemblance to the white, shiny cowry, called in old Italian porcella (little pig). Properties associated with porcelain include low permeability and elasticity; high strength, hardness, glassiness, durability, whiteness, translucence, resonance, brittleness, high resistance to chemical attack and thermal shock.
Porcelain is used to make table, kitchen, sanitary and decorative wares, objects of fine art and tiles. Its high resistance to the passage of electricity makes porcelain an excellent insulating material and it is widely used for high-voltage insulators. It is also used in dentistry to make false teeth, caps and crowns.
There are different kinds of porcelain.
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One is called soft-paste and is also called a semi-porcelain or proto-porcelain.
Another is hard-paste and is considered true porcelain.
Yet another is bone china which is a compromise between soft and hard porcelain.
All three are translucent (1: permitting the passage of light:transmitting and diffusing light so that objects beyond cannot be seen clearly ), have a shell like quality and give a bell like sound when tapped.
Again names are not a sure way of identifying porcelain due to all the conditions I mentioned in the "China" section above
I personally believe that if an item is translucent enough to pass light and emits a ringing sound when tapped (gently!) it would qualify as porcelain but this also applies to most delicate 'china'. Is there a difference? I really don't think it matters. Either way it would have to be of good quality and would have been made by dedicated potters.
To answer the question then, there is no drastic difference between any of these. They are all ceramics and very similar except in quality. Pottery is probably the simplest and easiest to manufacture since it does not require great heat to harden and is not always glazed. In most cases it is quite thick and heavy and appears almost crude when compared to a fine piece of porcelain or 'china'
Porcelain and china are one and the same really with porcelain really indicating a finer grade of china and 'china' is actually just a reference to the origin of fine porcelain which originated in China and was mostly called 'Chinaware' when first exported from that country.
There are many other names for china and ceramic wares most of which depend on the ingredients and firing techniques used by the potter. Some of these are explained in further FAQs below.
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What is bone china?
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Bone china
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A paste intermediate between hard porcelain and soft paste porcelain; a combination of clay and china stone made white and strong by the addition of calcified bone. Josiah Spode first marketed this product in 1794. Of fine texture and color, it gave enduring service at a cost far lower than that of fragile soft paste porcelain, and quickly replaced it in the English market. It is a type of porcelain body first developed in Britain in which calcified ox bone (bone ash) is a major constituent. It is characterized by high whiteness, translucency and strength. Production usually involves a two stage firing where the first, bisque, is without a glaze at 1280 °C (2336 °F), which gives a translucent product and then glaze, or glost, fired at a lower temperature below 1080 °C (1976 °F).
The use of bone ash had been known from the middle ages, when it was first used in cupels for the assaying of metals. Interest in it as a tableware ingredient emerged about 1750 and in the succeeding fifty years several experimental formulations were tried. However, these were 'soft-paste' porcelains with the inclusion of bone ash. Whereas what we now know as bone china is a true porcelain of china clay and Cornish stone with 45%-50% calcined bone.
It is actually a hybrid hard-paste porcelain containing bone ash. The initial development of bone china is attributed to Josiah Spode the Second, who introduced it around 1800. His basic formula of six parts bone ash, four parts china stone, and three and a half parts china clay remains the standard English body.
English manufacturers were keen to produce porcelain of the quality to be found in Chinese imports, but they had to go down a different route, since the clays, specifically kaolin was not available in the country then. The first use of bone ash in ceramics is attributed to Thomas Frye in 1748 to make a type of soft-paste porcelain, at his Bow China Works. In the late 18th century, Josiah Spode undertook further developments, and subsequently popularized it, by mixing it with kaolin and China stone to compete with the imported Oriental porcelain.
Spode was born in 1733 in Stoke-on-Trent, Staffordshire, England. The county of Staffordshire is world-renowned for its ceramics and porcelain. When he was 16 or 17, young Josiah apprenticed with Thomas Whieldon, one of the area’s finest potters. Spode worked for other potters and also co-owned factories with other potters until 1767 when he formed the Spode factory. This factory was wholly owned by him by 1776 and that factory remains in operation in the same spot today. It is the oldest porcelain factory to remain in business at the same site.
Josiah passed his factory on to his son, Josiah Spode II (1754-1827). Josiah II apprenticed in his father’s factory and opened a London gallery to showcase his father’s porcelain.
Bone china is the toughest of porcelains and does indeed contain bones. Bone ash makes up the greatest part of the formula for bone china, with the balance of the formula containing kaolin and petuntse. The resulting material is hard, resilient and an ivory white in color. It remains the standard for porcelain manufactured in England. Bone ash comes from the pulverized and burned bones of animals. All tissue is removed from the bones and they are fired at temperatures of up to 1000 degrees. The resulting ash is crushed to a powder and mixed with water before being added to the other porcelain material. Without this ash component, china is not really 'bone' china. It is also usually more expensive than other china, and this is justified by the processes and labour involved in its making. A piece of bone china contains at least 25% of bone ash, and this compound not only adds strength and white color to the china, but also makes it translucent. Not totally transparent, but enough for the light to pass through it.
Generally, bone china is registered and its trademark and pattern can be found under each piece. However, over time these can become difficult to read, and it's always good to know you can quickly verify its authenticity. Bone china is stronger than it appears, but care should still be taken when handling these dishes. Some newer pieces may be marked 'dishwasher safe', but I recommend always hand washing with a mild soap.
Dishwasher detergents are very harsh and over time will fade the pattern on your good dishes. There is also a possibility of these becoming chipped from rattling against other dishes during the dishwashing process.
Many bone china patterns have gold or metallic trims and bands, and these should never be placed in a microwave.
Bone china has lasted through generations and is beautiful heirloom pieces to hand down to the next one. But don't be afraid to use it, it is made to be enjoyed. In fact, tea and coffee tastes the best in bone china cups. I can attest to that - try it!
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What is soft paste porcelain or china?
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Porcelain, soft paste
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The history of soft-paste porcelain dates back to early attempts by European potters to replicate Chinese porcelain at a time when its composition was little understood and its constituent materials were not widely available in the West. The earliest formulations were mixtures of clay and ground-up glass or frit. Soapstone and lime were also known to have been included in some compositions. As these early formulations suffered from high pyroplastic deformation, or slumping in the kiln at raised temperatures, they were difficult and uneconomic to use in mass. Formulations were later developed based on kaolin (china clay), quartz, feldspars, nepheline syenite, and other feldspathic rocks. Soft-paste porcelain with these ingredients was technically superior to the traditional soft-paste and these formulations remain in production.
It was made from white china clay and a vitreous frit that produced translucence. Nearly all 18th century English porcelain is of this type. Firing is at a high temperature but not as great of that of hard paste porcelain, and the body is more liable to breakage. Soft-paste porcelain is a type of a ceramic material, but it lacks a more specific, universally agreed definition. Some writers have used the term for body formulations that combine clay and glass frit, mainly in the production of decorative figures and domestic wares in eighteenth century Europe,while others have used the term more widely to include other soft porcelains as well, such as bone china, Seger porcelain, vitreous porcelain, new Sèvres porcelain, Parian porcelain and soft feldspathic porcelain.
Soft-paste made with little clay is not very plastic and shaping it on the potter's wheel is difficult. Those pastes with more clay (now more commonly referred to as bodies), such as electrical porcelain, are extremely plastic and can be shaped by methods such as jolleying and turning. It was called "soft" because of its inability to hold rigid under high temperatures compared to hard-paste porcelain; the feldspathic formulations are however more resilient and experience less pyroplastic deformation. Soft-paste is fired at lower temperatures than hard-paste porcelain, typically around 1100oC, for the frit based compositions and 1200 to 1250 C for those using feldspars or nepheline syenites as the primary flux. The lower firing temperature gives artists and manufacturers some benefits, including a wider palette of colours for decoration and reduced fuel consumption. The body of soft-paste is more granular than hard-paste porcelain, less glass being formed in the firing process.
Experiments at Rouen produced the earliest soft-paste in France, when a 1673 patent was granted to Louis Poterat. It seems that not much of this was made. An application for the renewal of the patent in 1694 stated, "the secret was very little used, the petitioners devoting themselves rather to faience-making". Rouen porcelain, which is blue painted, is rare and difficult to identify.
The first important French porcelain was made at the Saint-Cloud factory, which was an established maker of faience (see FAQ on 'faience') . In 1702, letters-patent were granted to the family of Pierre Chicaneau, who were said to have improved upon the process discovered by him, and since 1693 to have made porcelain as "perfect as the Chinese". The typical blue-painted Saint-Cloud porcelain, says Honey, "is one of the most distinct and attractive of porcelains, and not the least part of its charm lies in the quality of the material itself. It is rarely of a pure white, but the warm yellowish or ivory tone of the best wares of the period is sympathetic and by no means a shortcoming; and while actually very soft and glassy, it has a firm texture unlike any other. The glaze often shows a fine satin-like pitting of the surface that helps to distinguish it from the brilliant shiny glaze of Mennecy, which is otherwise similar. The heavy build of the pieces is also characteristic and is saved from clumsiness by a finer sense of mass, revealed in the subtly graduated thickness of wall and a delicate shaping of edges."
Louis Henry, Duc de Bourbon established a soft-paste factory on the grounds of his château in Chantilly in 1730.
A soft-paste factory was opened at Mennecy by François Barbin in 1750. The Vincennes porcelain factory was established in 1740 under the supervision of Claude-Humbert Gérin, who had previously been employed at Chantilly. The factory moved to larger premises at Sèvres in 1756. A superior soft-paste was developed at Vincennes, whiter and freer of imperfections than any of its French rivals, which put Vincennes/Sèvres porcelain in the leading position in France and throughout the whole of Europe in the second half of the 18th century.The use of frit in this paste lent it the names "Frittenporzellan" in Germany and "frita" in Spain. In France it was known as "pâte tendre" and in England "soft-paste", perhaps because it does not easily retain its shape in the wet state, or because it tends to slump in the kiln under high temperature, or because the body and the glaze can be easily scratched.
(Scratching with a file is a crude way of finding out whether a piece is made of soft-paste or not.)
The first soft-paste in England was demonstrated by Thomas Briand to the Royal Society in 1742 and is believed to have been based on the Saint-Cloud formula. In 1749, Thomas Frye, a portrait painter, took out a patent on a porcelain containing bone ash. This was the first bone china, subsequently perfected by Josiah Spode.Recipes were closely guarded, as illustrated by the story of Robert Brown, a founding partner in the Lowestoft factory, who is said to have hidden in a barrel in Bow to observe the mixing of their porcelain. A partner in Longton Hall referred to "the Art, Secret or Mystery" of porcelain.In the fifteen years after Briand's demonstration, half a dozen factories were founded in England to made soft-paste table-wares and figures:
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What is agate ware?
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Agate ware (or agateware [sometimes agregate ware])
Agate is a type of quartz (silica), chiefly chalcedony, characterised by its fineness of grain and brightness of color. Although agates may be found in various kinds of rock, they are classically associated with volcanic rocks but can be common in certain metamorphic rocks.
The colorful agate and other chalcedonies were obtained over 3,000 years ago from the Achates River, now the Dirillo, in Sicily. The stone was given the name by a Greek by the name of Theophrastus, who discovered the stone along the shore line of the river Achates sometime between the 4th and 3rd centuries BC.
Agate ware consists of clays of various colours, natural or pigmented with colours which are mixed and mingled to produce a marbled effect. Agate ware can also be made by using different stains to achieve the colour variations mentioned above.Up to about the 1740s natural buffs and red clays were used together. Some clays turned white when fired and needed to be stained with metallic oxides in greens, greyish blues and browns ( first done by Thomas Whieldon).
The many different clays which abounded in Staffordshire no doubt first suggested a kind of combing and marbling, and led to the making of agate ware. In order to attain this effect layers of clay in various colors were laid one upon another, and “from this alternating strata thin slices were cut transversely by means of a wire. The slices were then pressed into moulds, and the irregular blending of the various clays produced a wavy pattern like marble. Sometimes the effect was improved by the use of a bluish glaze.”
By the 1750s many other Staffordshire potteries were making marbled clays and this process continued off and on until about 1820.
In the late 19th century agate ware was revived using different formulas, including a variation resembling horn, which continued to be made until about the 1920s.
To Further Confuse; (Note; I believe this NOT ceramic but enamelware!)
1850-1890
Lalance and Grosjean Mfg. Co. was one the first American companies to make porcelain enamelwares. These wares offered a cheaper, lighter alternative to cast-iron cookware. Most makers of porcelain enamelwares marked their products with a paper label that quickly washed off. Lalance & Grosjean marked their earlier wares with the blue, burned-in enamel brand. "Agate Ware," their brand name, became so widely used that it served as a generic name for all enamelware. This is called a "Turk's Head" cake mold because of its similarity to the shape of a turban. The spout in the middle helped to distribute the heat to the center of the cake as it baked
Make Your Own
Procedure:
1. Wedge 3 kg fine white earthenware clay.
2. Cut into three.
3. Add stains to desired colour to the three batches.
4. Roll slabs of the three colours 1/2" thick
5. Cut the slabs into 1/2" wide strips.
6. Align the strips into a pattern and roll, turning frequently to join.
This slab can be used as is, in a slump or hump mold, or can be further dissected into a patchwork design or made to order with colours purposfully positioned to form a decoration or drawing.
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What is Castleford ware?
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Castleford ware is stoneware which is dry bodied and porcelain like and was developed by David Dunderdale of Castleford, Yorkshire from around 1794. It is a term used for white, unglazed vitrified stoneware which seems opaque until held up to a light when it is actually semi-translucent. The pottery industry started in 1790 when Dunderdale & Co were established, who became famous for their fine ware pottery and stoneware, particularly Castleford teapots in white and black, which are now collectable items.
Follow this link for more information on Castleford, Yorkshire
http://www.castleford.org/history/cas022.html
CASTLEFORD WARE: This factory, about twelve miles from Leeds in Yorkshire, was established about 1790 by David Dunderdale. Cream ware, black basalt and white porcelain tea services with ornaments in relief were made there. The ware is seldom found with any color on it. Castleford ware was to some extent made for the American trade, soon to be overwhelmed by Staffordshire ware. Factory was discontinued in 1820. Reopened later, a pottery is still in operation there.
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What is glaze?
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Glaze is a layer or coating of a vitreous substance which has been fired to fuse to with a harden clay or ceramic object to color, decorate, strengthen or waterproof it.
It has been speculated that the first glazes were accidental and resulted from the presence in the kiln of lime-rich wood ash, which acted on the surface of the wares as a flux. Unlike their lower-fired counterparts, porcelain wares do not need glazing to render them impermeable to liquids and for the most part are glazed for decorative purposes and to make them resistant to dirt and staining. Great detail is given in the glaze article. Many types of glaze, such as the iron-containing glaze used on the celadon wares of Longquan, were designed specifically for their striking effects on porcelain.
Porcelain wares may be decorated under the glaze (see underglaze), using pigments that include cobalt and copper, or over the glaze (see overglaze) using coloured enamels. In common with many earlier wares, modern porcelain wares are often bisque-fired at around 1000 degrees Celsius, coated with glaze and then sent for a second glaze-firing at a temperature of about 1300 degrees Celsius, or greater. In an alternative method of glazing particularly associated with Chinese and early European porcelains the glaze was applied to the unfired body and the two fired together in a single operation. Wares glazed in this way are described as being green-fired or once-fired.
Glazing is functionally important for earthenware vessels, which would otherwise be unsuitable for holding liquids due to porosity. Glaze is also used on functional and decorative stoneware and porcelain. In addition to the functional aspect of glazes, aesthetic concerns include a variety of surface finishes, including degrees of gloss and matte, variegation and finished color. Glazes may also enhance an underlying design or texture which may be either the "natural" texture of the clay or an inscribed, carved or painted design.
Glaze may be applied by dry dusting a dry mixture over the surface of the clay body. Liquid glazes—suspensions of various powdered minerals, and metal oxides—can be applied by dipping pieces directly into the glaze, pouring the glaze over the piece, spraying it onto the piece with an airbrush or similar tool, with a brush, or with any tool that will achieve the desired effect.
To prevent the glazed article sticking to the kiln during firing either a small part of the item is left unglazed or special refractory supports, kiln spurs, are used as supports which are removed and discarded after the firing. Small marks left by these spurs can sometimes be visible on finished ware.The colour of a glaze before it has been fired may be significantly different than afterwards.
Special methods of glazing are sometimes carried out in the kiln. One example is salt-glazing, where common salt is introduced to the kiln to produce a glaze of mottled, orange peel texture. Materials other than salt are also used to glaze wares in the kiln, including sulphur. In wood-fired kilns fly-ash from the fuel can produce ash-glazing on the surface of wares.
During the Kofun period of Japan, high-fired, hard-bodied sue ware was decorated with greenish natural ash glazes. From 552 AD to 794 AD, differently colored glazes were introduced. The three colored glazes of the Tang Dynasty were frequently used for a period, but were gradually phased out; the precise colors and compositions of the glazes have not been recovered. Natural ash glaze, however, was commonly used throughout the country.
UNDERGLAZE
Decoration applied under the glaze on pottery is generally referred to as underglaze. Underglazes are applied to the surface of the pottery, which can be either raw, "greenware", or "bisque" fired (an initial firing of some articles before the glazing and re-firing). A wet glaze—usually transparent—is applied over the decoration. The pigment fuses with the glaze, and appears to be underneath a layer of clear glaze. An example of underglaze decoration is the well-known "blue and white" porcelain famously produced in England, The Netherlands, China and Japan. The striking blue color is achieved by using the powerful colorant cobalt in the form of either cobalt oxide or cobalt carbonate, both of which are still commonly used in glaze formulation today.
OVERGLAZE
Decoration applied on top of a layer of glaze is referred to as overglaze. Overglaze methods include applying one or more layers or coats of glaze on a piece of pottery or by applying a non-glaze substance such as enamel or metals (i.e., gold leaf) over the glaze.
ASH GLAZE
Ash Glazes are types of high temperature glazes for stoneware pottery that include the ashes of trees, shrubs, plants or grasses within the glaze recipe.
Plant ashes are a complex mixture that reflects the nutritional requirements and therefore composition of the living plant. High in calcium and also incorporating other alkaline material, ash behaves as a flux encouraging the glass forming oxide silica to melt at a temperature within the scope of a pottery kiln. Ash glazes often have a characteristic mottled or streaky texture depending on the amount of ash incorporated.
GLAZE DEFECTS
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Many Glaze defects are the result of a problem in the way that the clay and glaze interact. The most common problem is when the clay body and the glaze do not physically fit each other.
Faults arising from a mismatch of the respective thermal expansions of the body and glaze may be evident immediately from the kiln or otherwise may only occur days or even weeks after firing. In extreme case the fault may run not only through the glaze, but the body as well; these cracks often completely destroy the pot. Such a condition is occasionally referred to as dunting, however this would be incorrect as the term is specific to a crack that results from thermal shock
Crazing
Crazing appears in the glazed surface of fired ware as a network of fine hairline cracks. This can be seen as an aesthetic flaw, and in the case of functional pottery it is a sanitary concern because these cracks, although microscopic in width, can potentially harbor bacteria. Some glazes are intentionally formulated to cause this flaw for its aesthetic qualities. These are known as crackle glazes. Such effects are popular for glazes on Raku.
Crazing is caused by the glaze being under too much tension. The tension occurs when the glaze contracts more than the body during cooling in cases where the glaze material has a higher coefficient of thermal expansion than the body. The different thermal expansion or shrinkage properties of the clay body and the glaze will determine if the glaze crazes.
Shivering
Shivering is a defect that results in tiny slivers of glaze separating from the body. Often this is only noticed in a pot several days after it has been fired when it has been sitting in one place long enough for a noticeable amount of glaze fragments to accumulate on the surface beneath it.
Shivering is caused by the clay body shrinking more during cooling than the glaze. If this stress is great enough it will cause pieces of glaze to crack and separate from the pot. The stresses that cause shivering are the opposite of those that cause crazing.
Pinholes
Pinholes are pinhead sized areas where the glaze has receded and left bare clay exposed. When these form they will generally occur in large numbers all over the glazed surface of a pot but they can be present in smaller numbers and isolated areas. The most common cause of pinholes is the release of gases from the clay body during firing. This out gassing causes small bubbles to form in the glaze that will then leave a bare area when they burst if the surface tension of the glaze is sufficient.
This defect occurs more commonly in low fired ceramics than stoneware. For this reason it is a common practice, when a pot will be glazed with low fire glaze, to fire the pot one or two cones higher when bisqueing than it will be fired with glaze. For instance: a pot intended to be glazed with cone 06 glaze might be bisque fired to cone 04. By burning off all of the gasses during the bisque this technique prevents them from disturbing the glaze surface during the glaze firing. This technique is impractical for stoneware however, because bisque firing to a stoneware temperature would vitrify the clay and make it quite difficult to apply glaze.
Crawling
Crawling is a glaze defect characterized by glaze beading up and leaving large, irregular areas of bare clay on the surface of a pot. This defect is caused by an error in glaze formulation that gives the glaze high enough surface tension to pull away from the surface of the clay.
Crawling is also thought to be caused when a dirty pot is glazed without being cleaned first. If a pot has built up a significant level of dust (which is a common occurrence in many potter's studios) and glaze is applied over that layer of dust it can cause problems during the firing. When the dust combusts during the firing, gas can build up under a viscous glaze and cause it to crawl away from the surface of the clay.
It should be noted that crawling is not always considered a defect. There are certain glazes, such as Shino, that are intentionally formulated to crawl in a more predictable and regular fashion as a form of surface decoration.
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What is Felspar porcelain?
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Felspar porcelain is a refinement of bone china developed by Spode at the end of the 18th century whereby pure felspar (or Feldspar, see below) was added to the body along with proportions of china clay and china stone. This resulted in an extremely hard, very translucent and heat-resistant variation of bone china but also a costly process. (see What is Feldspar?) and (What is Felspathic ware?)
Feldspar
Feldspars are a group of rock-forming minerals that constitute almost 60% of the earth's crust. Any of a group of silicate minerals. Feldspars are the most abundant mineral type in the Earth's crust. They are the chief constituents of igneous rock and are present in most metamorphic and sedimentary rocks. All feldspars contain silicon, aluminum, and oxygen, linked together to form a framework. Spaces within this framework structure are occupied by sodium, potassium, calcium, or occasionally barium, in various proportions. Feldspars form white, grey, or pink crystals and rank 6 on the Mohs scale of hardness.
The four extreme compositions of feldspar are represented by the minerals orthoclase, KAlSi3O8; albite, NaAlSi3O8; anorthite, CaAl2Si2O8; and celsian, BaAl2Si2O8. Plagioclase feldspars contain variable amounts of sodium (as in albite) and calcium (as in anorthite) with negligible potassium content. Alkali feldspars (including orthoclase) have high potassium content, less sodium, and little calcium.
The type known as moonstone has a pearl-like effect and is used in jewelry. Approximately 4,000 tonnes of feldspar are used in the ceramics industry annually.
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What is crouch ware?
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Crouch-ware, or, as it is incorrectly and inappropriately called, Elizabethan-ware. Crouch is the name neither of a person nor of a place, but of the white Derbyshire clay. The paste made from this clay is very dense, and is of a greenish tint.
Crouch ware is a drab, grey coloured stoneware made in Germany and elsewhere on the continent which was exported around the 16th and 17th centuries. The name might derive from the French term 'cruche' which means pitcher, since many wine and liquor containers were made from this eartenware, both semi-vitrified or salt glazed.
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What is crazing?
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Crazing
Crazing appears in the glazed surface of fired ware as a network of fine hairline cracks.. This can be seen as an aesthetic flaw, and in the case of functional pottery it is a sanitary concern because these cracks, although microscopic in width, can potentially harbour bacteria. Some glazes are intentionally formulated to cause this flaw for its aesthetic qualities. These are known as crackle glazes. Such effects are popular for glazes on Raku.
Crazing is caused by the glaze being under too much tension. The tension occurs when the glaze contracts more than the body during cooling in cases where the glaze material has a higher coefficient of thermal expansion than the body. The different thermal expansion or shrinkage properties of the clay body and the glaze will determine if the glaze crazes.
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What is Feldspar?
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feldspar
Feldspars are a group of rock-forming minerals that constitute almost 60% of the earth's crust.Any of a group of silicate minerals. Feldspars are the most abundant mineral type in the Earth's crust. They are the chief constituents of igneous rock and are present in most metamorphic and sedimentary rocks. All feldspars contain silicon, aluminium, and oxygen, linked together to form a framework. Spaces within this framework structure are occupied by sodium, potassium, calcium, or occasionally barium, in various proportions. Feldspars form white, grey, or pink crystals and rank 6 on the Mohs scale of hardness.
The four extreme compositions of feldspar are represented by the minerals orthoclase, KAlSi3O8; albite, NaAlSi3O8; anorthite, CaAl2Si2O8; and celsian, BaAl2Si2O8. Plagioclase feldspars contain variable amounts of sodium (as in albite) and calcium (as in anorthite) with a negligible potassium content. Alkali feldspars (including orthoclase) have a high potassium content, less sodium, and little calcium.
The type known as moonstone has a pearl-like effect and is used in jewellery. Approximately 4,000 tonnes of feldspar are used in the ceramics industry annually.
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What is Felspathic ware?
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Felspathic ware is a refined clay body to which feldspar has been added. (See What is Feldspar?) (What is Feldspar porcelain?) resulting in tough,almost translucent white body
with a faint yellow tint.
Confusingly this is also known as;
Semi-porcelain
Demi-porcelain
opaque porcelain
and also 'ironstone' 'flingware' and 'graniteware'
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What is porcelain?
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PORCELAIN
Porcelain is a ceramic material made by heating raw materials, often including clay in the form of kaolin, to high temperatures in a kiln at temperatures between 1,200 °C (2,192 °F) and 1,400 °C (2,552 °F). The toughness, strength, and translucence of porcelain arise mainly from the formation of glass and the mineral mullite within the fired body at these high temperatures .
Porcelain was named after its resemblance to the white, shiny cowry, called in old Italian porcella (little pig). Properties associated with porcelain include low permeability and elasticity; high strength, hardness, glassiness, durability, whiteness, translucence, resonance, brittleness, high resistance to chemical attack and thermal shock.
For the purposes of trade, the Combined Nomenclature of the European Communities defines porcelain as being "completely vitrified, hard, impermeable (even before glazing), white or artificially coloured, translucent (except when of considerable thickness) and resonant." However, the term porcelain lacks a universally agreed definition and has "been applied in a very unsystematic fashion to substances of diverse kinds which have only certain surface-qualities in common" (Burton 1906).
Porcelain is used to make table, kitchen, sanitary and decorative wares, objects of fine art and tiles. Its high resistance to the passage of electricity makes porcelain an excellent insulating material and it is widely used for high-voltage insulators. It is also used in dentistry to make false teeth, caps and crowns.
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What is earthenware?
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The most ancient pottery was fired earthenware (terracotta), which is known to date back to the Mesolithic period in northern Europe and East Africa. Today, pots fired in the traditional method for local use in parts of South America, Indonesia, Africa, and the Indian subcontinent are sometimes burnished to a smooth finish, which strengthens them. They often have an attractively uneven distribution of shades due to different rates of oxidization in the low temperature of an open fire (about 600°C/1,000°F); kiln-fired pots (fired at 1,000–1,200°C/1,832–2,200°F) are more evenly coloured and matt.
Earthenware is a common ceramic material, which is used extensively for pottery tableware and decorative objects. Although body formulations vary tremendously between countries, and even between individual makers, a generic composition is 25% ball clay, 28% kaolin, 32% quartz, and 15% feldspar. Earthenware is one of the oldest materials used in pottery. While red earthenware made from red clays is very familiar and recognizable, white and buff colored earthenware clays are also commercially available and commonly used.
earthenware
Pottery made of porous clay and fired at relatively low temperatures of up to 1,200°C/2,200°F. It does not vitrify but remains porous, so will continue to absorb fluids. Earthenware may be unglazed (terracotta flowerpots, wine-coolers) or glazed to give a smooth, shiny, waterproof surface (most tableware); the glaze and body characteristically form quite separate layers.
Earthenware is commonly bisque, or biscuit, fired to temperatures in the range of 1000 and 1150 degrees Celsius (1800 and 2100 degrees Fahrenheit, and glost fired from 950 to 1050°C (1750 to 1925°F). However examples of the the reverse, low biscuit firing and high glost, can also be found: this can be popular with some studio potters where bisque temperatures may be 900 to 1050°C (1650 to 1920°F ) with glost temperatures in the range of 1040 to 1150°C (1900 to 2100°F). The exact temperature will be influenced by the raw materials used and the desired characteristics of the finished ware. The higher firing temperatures are likely to cause earthenware to bloat. After firing the body is porous and opaque with colours ranging from white to red depending on the raw materials used.
Earthenware may sometimes be as thin as bone china and other porcelains, though it is not translucent and is more easily chipped. Earthenware is also less strong, less tough, and more porous than stoneware - but its low cost and easier working compensate for these deficiencies. Due to its higher porosity, earthenware must usually be glazed in order to be watertight.
Although production of tin-glazed earthenware began in the Netherlands and England in the 16th century, it was not actually made in Delft until around 1600. By the late 17th century, Delft had become the most famous center of production. Variations on the name 'delftware' have since become common in Britain for both English and Dutch pottery of this type. Wares known to have been made in the town itself are now simply called 'Delft'.
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What is basaltes or basalts stoneware or Egyptian black stoneware?
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Basaltes stoneware is a fine grained earthenware stained with black and manganese dioxide. Fully vitreous it was developed by Josiah Wedgwood as a refinement of an earlier Egyptian black earthenware. Basaltes was fired twice, the second time at red heat after being coated with potter's varnish to give it a permanent gloss which was even more enhanced by polishing.
Basalts stoneware is the same as above but usually denotes a lesser quality then Basaltes and was used in production (and reproductions) later in time.
Egyptian black stoneware is a vitreous stoneware stained black with iron oxide and fired once at a temperature hot enough to make it non-porous and vitrified.
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What is Delftware or Delft?
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Delftware is an earthenware made from natural clays, fired once and dipped in lead glaze made white and opaque with the addition of tin.
This was a common technique all across Europe from the earliest days of pottery and ceramics.
In France it is known as faience.
In Italy it is called maiolica.
In England it was known as galleyware (due to it's use as ballast in the holds of sailing ships I believe)and used primarily for apothecary use until blue and white porcelain techniques became more sophisticated.
It was not called Delftware in England until Georgian times when large quantities of tin enamelled wares were being made in Holland, near the town of Delft. By this time tin glazed earthenware had been supereded by creamware.
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What is shivering?
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Shivering
Shivering is a defect that results in tiny slivers of glaze separating from the body. Often this is only noticed in a pot several days after it has been fired when it has been sitting in one place long enough for a noticeable amount of glaze fragments to accumulate on the surface beneath it.
Shivering is caused by the claybody shrinking more during cooling than the glaze. If this stress is great enough it will cause pieces of glaze to crack and separate from the pot. The stresses that cause shivering are the opposite of those that cause crazing.
Faults arising from a mismatch of the respective thermal expansions of the body and glaze may be evident immediately from the kiln or otherwise may only occur days or even weeks after firing. In extreme case the fault may run not only through the glaze, but the body as well; these cracks often completely destroy the pot. Such a condition is occasionally referred to as dunting, however this would be incorrect as the term is specific to a crack that results from thermal shock
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What is ironstone?
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Ironstone china
(see also What is Felspathic ware?)
type of stoneware or felspathic ware , made by adding a finely ground glassy substance made from molten slag to a refined clay.The result was a dense, hard, durable stoneware that came to be known by several names—e.g., semiporcelain, opaque porcelain, English porcelain, stone china, new stone etc.
as we know it was first patented in 1813 by Charles James Mason in Staffordshire, England. It was an improved china harder than earthenware and stronger than porcelain. It was patented as "Mason's Patent Ironstone China". Mason's patent lasted only fourteen years, and by 1827 a number of other potters had already experimented with his formulas. All of these wares were decorated with transfer patterns or brush-stroke designs. Occasionally an undecorated piece would find its way out of the factory, possibly because it was flawed in some way.
Late in the 1850's and into the 1860's huge quantities of china were sold to the agricultural communities and called "thrashers' ware." These dinner, tea and chamber sets were embossed with wheat, prairie flowers and corn in order to appeal to the farmers, who had to feed all the people that helped with the harvest.
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What is ironstone china or porcelain?
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ironstone china- A hard durable earthenware fired at a high heat. Variations are red and brown stoneware and Wedgwood's black basalt.
The Beginning of White Ironstone
Ironstone china as we know it was first patented in 1813 by Charles James Mason in Staffordshire, England. It was an improved china harder than earthenware and stronger than porcelain.
Mason's patent lasted only fourteen years, and by 1827 a number of other potters had already experimented with his formulas. All of these wares were decorated with transfer patterns or brush-stroke designs. Occasionally an undecorated piece would find its way out of the factory, possibly because it was flawed in some way.
In the 1840's, England began exporting the undecorated wares to the American and Canadian markets. The English potters discovered that the "Colonies" preferred the unfussy plain and durable china. Specifically, it was 1842 when James Edwards marketed the first white ironstone china in America.
Late in the 1850's and into the 1860's huge quantities of china were sold to the agricultural communities and called "thrashers' ware." These dinner, tea and chamber sets were embossed with wheat, prairie flowers and corn in order to appeal to the farmers, who had to feed all the people that helped with the harvest.
Little of this plain embossed white ironstone could be found in England until just recently, when a staff member of the City Museum and Art Gallery of Stoke-on-Trent visited the U.S. He purchased several pieces which now reside in the Museum.
"What the public will have the manufacturer must make," said a nineteenth-century British potter. In a century of technological advancement and restless change, potters had constantly to come up with something new.
At the beginning of the century, cream-coloured earthenware was still much in use. It was soon, however, to be superseded in popularity by newer types. One of these was a high-fired earthenware, stronger and more durable than anything that had gone before.
When it first came on the market, the new earthenware was given the blue-grey appearance of Chinese export porcelain. Its decoration, often hand-painted within printed outlines, was frequently adapted from the Oriental. Many potters made and exported it, but it was Staffordshire's Charles James Mason who took out a patent for it in 1813, calling it Ironstone China. "Ironstone" suggested strength; "China" suggested porcelain. But it was, in fact, an earthenware.
Other potters exported similar bodies, using names such as Stone China, Granite China, Pearl Stone and Dresden China.
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What is biscuit, bisque or biscuit porcelain?
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Biscuit, bisque or biscuit porcelain (china or pottery) is a one time fired body or paste before decoration or glazing is done.It is a soft paste, soapstone and also hard paste porcelain fired at a temperature which is hot enough to cause a chemical change but not high enough to vitrify the paste.It was then left undecorated and unglazed. It is a fired piece of unglazed ceramic ware. Depending on the technique and materials used, it is either the final article, such as dolls' heads, or an intermediary stage before the article has a coating of glaze applied and is then fired again.
A bisque firing is usually at least 1000°C. The firing of the greenware that results in the bisque article causes permanent chemical and physical changes to occur. These result in a much harder and more resilient article which is still porous and able to absorb glaze and has no chemically bonded water left in the clay. Bisque is a true ceramic material, although the clay body has not yet reached maturity.
To bisque is to fire the clay for the first time.
Bisque fire is the first firing and is usually only to between cones 08 and 06 (1720 and 1835 degrees F or 945 and 1005 degrees C). However, sometimes a clay matures at a higher temperature than the glaze that the potter wants to use on the pot. When that is the case the bisque firing may be higher in temperature, with a lower temperature glaze firing.
Many hobbyists are familiar with the bisque molds available for decorating and firing to achieve a unique personal item without the difficulty of findinding the right clay and molding it.
Many famous potteries exported and sold bisque wares which were then decorated in special design studios or in different parts of the world. This is why sometimes you may find more than one mark on a piece.
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What are dry body stonewares?
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dry body stonewares
Fine-grained, non-porous stoneware body requiring no glaze. Often decorated with die stamped reliefs, sprig designs, or engine turning. Tea and coffee pots are the most common forms, but other tablewares and decorative pieces also occur. Common English dry bodied varieties include the red stonewares (often called "Elers-type"), as well as black basalts and jasperwares (of Wedgwood fame).The English dry bodied stoneware paste is usually fine grained and non-porous, even semi-vitrified, although Dwight’s wares were often coarser and could have quartz and iron ore inclusions.
Dry bodied stonewares were produced from local clays, sometimes with the addition of colored oxides or ochreous earths. There are many variations of color due to the clay mixtures and the firing environment. Dwight’s pieces were generally dark red, but vessels ranging from greenish-brown to gray, or with a gray reduced core, have also been found. Some Elers vessels were chocolate brown, rather than red. Wedgwood and others made stonewares similar to black basalt, but in buff, light red, gray, and white, while rosso antico could range from dark red to chocolate. Jasperware could be tinted blue, green, lilac, black, and other colors.
Red Stoneware
Chinese red stoneware tea services were being exported to Europe by at least the 1660s. By the mid-1670s, English potter John Dwight was making imitations of the Chinese ware, as were various Dutch and German potters. Dwight patented his ceramic in 1684. The Elers brothers began making a superior red stoneware by 1693. Dwight appears to have stopped production of red stoneware around 1695, while the Elers were out of business by 1700, so these 17th century wares would be very rare on American sites. After this, red stoneware production did not resume until the 1740s at the earliest, but certainly by the mid-1750s. Engine turned decorations became common after 1760. Red stoneware tea and coffee wares were popular into the 1780s, and are often found on American sites dating to the third quarter of the 18th century. In 1776, Wedgwood produced his rosso antico variant, which continued into the 19th century
Black Basalt
Experimentation with black dry bodied stoneware began in the late 1750s, and was perfected by Wedgwood in the 1760s . This type of ware was widely imitated by other potters until the early 19th century, but remained in limited production through the 20th century .
Jasperware
Wedgwood began experimenting with this ceramic in the early 1770s, and had perfected it by 1780. It is still produced by Wedgwood today, but other potters were making it in the 18th century.
In the 17th century, Dwight’s dry bodied stonewares were wheel-thrown, while Elers vessels were mostly produced by slip casting. Both would turn their products on a lathe. In the 18th century, dry-bodied stonewares were generally thrown or molded.
Glaze
Dry bodied stonewares were not glazed, but some of Dwight’s vessels had a lustrous surface, possibly due to "heat polishing," while 18th century vessels were also occasionally polished.
Decoration
Dwight’s red stoneware vessels were generally undecorated, although he did apparently use sprig molds for a short time in the 1690s. The Elers commonly applied sprigs and die-stamped molds, often with floral designs, and occasionally painted their pieces. Eighteenth century red stoneware was often decorated with sprigs or die-stamped molded reliefs, typically in floral designs or animal and human figures. Rosso antico often had reliefs in other colors, especially black. Engine turned designs were common after 1760. Psuedo-Chinese seal marks appear on the bases of some vessels, and were also used by the Elers. Black basalt could be enamel painted, in addition to employing the decorative techniques found on red stoneware. The reliefs on jasperware were typically white.
Form
Dwight made red stoneware teapots and tea bowls, as well as jars and beakers. The Elers produced similar forms, along with cups, mugs, and tankards. Eighteenth century red stonewares were mostly tea and coffee services; flatwares and other forms were rare. Black basalt was produced as teawares, as well as vases and other decorative pieces. Jasperware occurred as teaware, vases and other decorative pieces, and medallions
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What are pinholes?
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Pinholes
Pinholes are pinhead sized areas where the glaze has receded and left bare clay exposed. When these form they will generally occur in large numbers all over the glazed surface of a pot but they can be present in smaller numbers and isolated areas. The most common cause of pinholes is the release of gases from the claybody during firing. This outgasing causes small bubbles to form in the glaze that will then leave a bare area when they burst if the surface tension of the glaze is sufficient.
This defect occurs more commonly in low fired ceramics than stoneware. For this reason it is a common practice, when a pot will be glazed with low fire glaze, to fire the pot one or two cones higher when bisqueing than it will be fired with glaze. For instance: a pot intended to be glazed with cone 06 glaze might be bisque fired to cone 04. By burning off all of the gasses during the bisque this technique prevents them from disturbing the glaze surface during the glaze firing. This technique is impractical for stoneware however, because bisque firing to a stoneware temperature would vitrify the clay and make it quite difficult to apply glaze.
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What is flint ware?
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Flint ware is an earthenware made by adding calcined finely powdered flint to clay bodies which produced a lighter weight , more durable earthenware when fired at high temperatures.
Apparently used by potters such as John Astbury in the early 18th century, it did not become commonly used until the beginning of the 19th century when it was used for felspathic wares and ironstones. (see What is Feldspar) (What are felspathic wares?)
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What is creamware?
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Creamware- A mixture similar to ironstone of refined clay and flint but fired at a less intense heat. When a clear glaze was evolved that could be applied as a liquid dip, the resulting cream colored earthenware became immediately popular. Wedgwood and Leeds are the names primarily associated with early creamware.
Creamware is a cream-coloured earthenware created about 1750 by the potters of Staffordshire, England, which proved ideal for domestic ware. It was popular until the 1820s. It was also known as tortoiseshellware or Prattware depending on the color of glaze used.
The most notable producer of creamware was Josiah Wedgwood. Around 1779, he was able to lighten the cream color to a bluish white and sold this more desirable product under the name pearl ware. Wedgwood supplied his creamware to Queen Charlotte and Catherine the Great and used the trade name Queen's ware.
Much that was imported was unmarked as to maker. It came from Scottish as well as English potters. Records exist, however, to show that Wedgwood was owned by such people as Sir James Monk, attorney-general of Quebec, and Sir Robert Shore Milnes, lieutenant-governor of the province. Early in the nineteenth century, a Quebec merchant was advertising "Wedgwood's finest cream-coloured Earthen Ware, in crates, each containing a complete dinner-service." Until the second half of the century, however, it was only occasionally that an importer mentioned any potter's name in advertisements.
Another known supplier of creamware to Canada was Liverpool's Herculaneum Pottery, and one of the rarities in the Museum's collection is a small Herculaneum plate with a lustre rim. It is a rarity because lustre was not often used at this pottery. Also, the overglaze printed decoration — of a sailor taking soundings — is usually found on unmarked specimens.
It was Herculaneum's practice to give ships' captains samples of its products to show to prospective customers abroad. In 1798 (two years after the founding of the pottery), the captain of the sailing ship Ephron arrived in the port of Quebec with a selection of Herculaneum earthenware. He showed it to George Pozer, a prominent merchant. Pozer liked what he saw and sent off an order for creamware. He also became an agent for the Liverpool pottery. Other agents, possibly recruited in the same way, were appointed in Prince Edward Island, Nova Scotia and Newfoundland.
As the nineteenth century advanced, earthenware that was cream in colour ceased to be the ware most commonly found on Canadian tables. It was superseded by newer wares, but it never entirely disappeared.
If hand-painted, the decoration was now frequently applied within printed outlines. When the "Japanese mania" swept over the Western world, reaching its height of popularity in the last quarter of the century, creamware decoration often reflected the new craze.
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What is black porcelain?
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Black porcelain is a stoneware which is made from clays which turned black once fired in a kiln.
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What is crawling?
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Crawling
Crawling is a glaze defect characterized by glaze beading up and leaving large, irregular areas of bare clay on the surface of a pot. This defect is caused by an error in glaze formulation that gives the glaze high enough surface tension to pull away from the surface of the clay.
Crawling is also thought to be caused when a dirty pot is glazed without being cleaned first. If a pot has built up a significant level of dust (which is a common occurrence in many potter's studios) and glaze is applied over that layer of dust it can cause problems during the firing. When the dust combusts during the firing, gas can build up under a viscous glaze and cause it to crawl away from the surface of the clay.
It should be noted that crawling is not always considered a defect. There are certain glazes, such as Shino, that are intentionally formulated to crawl in a more predictable and regular fashion as a form of surface decoration.
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What is Parian ware parian porcelain etc.
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Parian ware is a porcelain introduced about 1840 by the English firm of Copeland & Garrett, in imitation of Sèvres biscuit (fired but unglazed porcelain). Its name is derived from its resemblance to Parian marble. Again it is another porcelain using feldspar as an ingredient.
(See What is feldspar?)
The official catalogue of the Great Exhibition of 1851 gives Thomas Battam credit for inventing Parian, saying that "he succeeded in producing a very perfect imitation of marble, both in surface and in tint." While Battam may have invented it, several English factories claimed credit for its development. But the Staffordshire firm operated by William Taylor Copeland and Thomas Garrett was the first to produce and sell it in 1842, and went on to become one of its major manufacturers.
Several potteries marketed it under different names. The Copeland firm called it "statuary porcelain" because of its resemblance to the fine white marble of neoclassical sculpture. Wedgwood named it "Carrara," after the Italian quarry patronized by Michelangelo. But it was Minton which coined the word "Parian" to suggest Paros, the Greek isle that furnished much of the stone used in the classical period. Thus, it quickly became the medium's generic name.
Ultimately, potteries produced two varieties of Parian ware: statuary Parian, used in the making of figures and reproductions of sculpture, and standard, Parian, from which they made hollowware. Statuary Parian, incorporating a glassy frit–a semi-fused substance used to add density–was classified as soft porcelain. Standard parian, with a greater proportion of feldspar in the composition but no frit, was hard porcelain. The presence of iron in the feldspar without iron silicate caused early Parian statuary to appear ivory-tinted. Both English and American potters either obtained details of the original formula or worked out their own, resulting in enormous production of Parian wares on both sides of the Atlantic. Plus the invention in 1844 of a patented machine that allowed scaled reproductions of larger bronze or marble originals made replicas of figures and busts by noted sculptors widely available.
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What is Jasperware?
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Jasperware- A dense vitrified stoneware of nearly the same properties as porcelain, developed in 1774 by Josiah Wedgwood and still produced today. Adams and Turner also produced jasperware. Its name derives from the fact that it resembles the natural stone jasper in its hardness. Jasper is white in its natural state and is stained with metallic oxide colouring agents. The most common shade is pale blue, but dark blue, lilac, sage green, black, and yellow were also used. The earliest jasper was stained throughout and was known as "solid," whereas the later varieties were coloured only on the surface and were known as "dip."
Decorations, in the Neoclassical style and usually white, were made in separate moulds and applied to the body of the piece. Objects made of jasper were varied and included vases, plaques, tableware, cameos, furniture mounts, and portrait medallions.
The finest examples of the medallions were modelled by the English sculptor John Flaxman and by Wedgwood's principal modeler, William Hackwood. Outstanding are Wedgwood's 1790 reproductions in jasper of the Portland Vase (excavated from a tomb outside Rome in the early 17th century), one of which is now in the British Museum, London.
Jasperware is still produced by Wedgwood's today
Jasperware (or jasper ware) is a form of pottery that has a stoneware body which is either white or colored, which is noted for its matte finish. It was first developed by Josiah Wedgwood and its best known form is the popular blue-and-white ware, but it comes in many other colors. The term 'jasper' is not a personal name in this context (i.e. jasper, not Jasper): it comes from the Greek 'iaspis', itself of oriental origin and related to the Hebrew 'yaspeh', for an opaque variety of quartz, usually red, yellow or brown.
Dating Jasperware
Wedgwood jasperware can often be dated by the style of potter's marks, although there are exceptions to the rules:
Before 1860: Mark is "Wedgwood". Usually accompanied by other potter markings and a single letter.
After 1860: A three-letter mark represents in order, the month, the potter, and the year. The year code starts mid-alphabet with the letter "O" for 1860, the letter "P" for 1861, etc., returning to "A" after "Z". For certain letters there are two possible year dates.
1891-1908: Marks are "Wedgwood", "England", separated.
1908-1969: Marks are "Wedgwood", "Made in England", separated, or "Wedgwood England" on small objects like thimbles.
1970-present: Mark is "Wedgwood Made in England" as single stamp
The Jasper body was the product of years of painstaking experiments. It was in 1772 that Josiah started his quest for the new ceramic material and not until November 1774 that he made his first bas-relief figures.
By the time that his partnership with Thomas Bentley was ended with Bentley's death in 1781 the range of Jasper products produced was extensive. Cameos, intaglios, and small busts were produced. Vases, plaques and bough pots were crafted of the new material.
The crowning achievement and one that sealed jasperware as the most sought after decorative pottery in England and the Continent was his reproduction of the famous Portland Vase in 1790 after 4 years of laborious trials.
THE IMITATORS
The importance of his discovery and the popularity of his designs produced a spate of imitators seeking to capitalize on the new range.
Adams was the ware that most resembled Wedgwood's in all but colour. Others whose quality approached the original were Palmer, Wilson Neal and Hollins.
On the Continent Sevres brought out a range of blue porcelain decorated in white and Meissen brought out a range of blue porcelain with integrally cast white embossing named Wedgwoodarbeit, literally Wedgewood Work. The flattery of the imitators was certainly sincere.
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What is bone porcelain?
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Similar to bone china but not as durable, bone porcelain is a soft porcelain with added calcined bone ash and was first used by the Bow porcelain factory around 1750. Intended mainly for dinner ware since it was not able to withstand the heat of boiling water used for tea. It was also used for figurines and ornaments until about 1775 when the factory closed.
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What is Blanc-de-Chine?
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Blanc-de-Chine is a type of Chinese porcelain, usually white, made at Dehua in the Fujian province from the Ming Dynasty (1368-1644) to the present day. The term Blanc-de-Chine or "Chinese White Ware" is strictly speaking a misnomer. The area kilns produced a variety of ceramic wares, least of which was a stunning output of underglaze blue. Many of the best extant examples of Blanc-de-Chine were and are found in Japan where they are under appreciated due to their use in family altars (butsudan) and other funerary and religious uses. Dehua white porcelain in Japan is a separate subject in itself. In Japan the white variety was termed hakugorai or "Korean white", a term often found in tea ceremony circles. The term Dehua Ware is taken from the geographical name where the ware originates. The area along the Fujian coast was traditionally one of the main ceramic exporting centers. Over one-hundred and eighty kiln sites have been identified extending in historical range from the Song period to present. The two principal kiln sites were those of Qudougong 屈斗宫 and Wanpinglun 碗坪仑. The Wanpinglun site is the oldest of the two and manufactured pressed wares and others. from the Ming period porcelain images were manufactured that achieved a fusion of glaze and body traditionally referred to as "ivory white" and "milk white." Colored glazes and underglaze blue began in the 17th century and continued through the Qing period. Notable artists such as the late Ming period He Chaozong signed their creations with their seals. Wares includes crisply modeled figures, cups, bowls and joss stick-holders. Blanc-de-Chine was exported to Europe and copied in the 17th and 18th centuries.
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What is majolica or maiollica?
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Majolica- A general term for a variety of ceramics decorated with an opaque tin glaze, usually brightly colored. In England in 1851, Herbert Minton developed a cane colored stoneware molded or pressed in high relief with details clear and sharp. The body was then dipped into tin enamel and fired. The final result began a Victorian craze for the brightly colored pieces that continues today.
Majolica or maiolica may refer to:
Maiolica - ceramics from Renaissance Italy with an opaque, white glaze containing tin oxide, usually painted in several colors, sometimes called majolica in English-speaking countries.
Victorian majolica - ceramics made in 19th century Britain and the USA with molded surfaces and colorful lead glazes.
Maiolica
Maiolica designates Italian tin-glazed pottery dating from the Renaissance.
The name is thought to come from the medieval Italian word for Majorca, an island on the route for ships that brought Spanish lustred Hispano-Moresque wares, to Italy from Valencia in the 15th and 16th centuries, or from the Spanish term obra de Malaga that denotes “[imported] wares from Malaga”. Majorca and other Balearic islands were under Muslim rule until 1230. Italian ships, mainly Genoese and Venetians, often called there to collect tin glazed pottery as well as other goods, gradually leading to the foundation of the so called 'Majolica' or 'Maiolica' pottery style, after the island of Majorca. Moorish potters from that Island were also recruited and brought to Sicily to work on this style. Other academics, like art historian John Sweetman,[1] thought Maiolica originated from Malaga through the movement of its pottery and craftsmen. Since the fifteenth century the Majolica reached an astonishing perfection, using the same production and decorative techniques as the Andalusians and Egyptians. Italian artists later developed several new varieties including the Gubbio lustre , which used colours such as greenish yellow, strawberry pink and a ruby red. Maiolica pattern dominated the ceramic industry in Italy to the extent that it was used also for metallic lustre in the 1530's. Drury in his work "Maiolica" suggested that this ware reached America from Sicily and is "it occurs in the form of plates, covered bowls, and 'albarello' and is supposed to be the workmanship of Moorish potters in Caltagiron."[2] Caltagirone is a city in province of Catania, Sicily.
During the Renaissance, the term maiolica referred solely to lusterware, including both Italian-made and Spanish imports, but eventually the term came to be used when describing ceramics made in Italy, lustered or not, of tin-glazed earthenware. With the Spanish conquest of Mexico, tin-glazed maiolica wares came to be produced in the Valley of Mexico as early as 1540, at first in imitation of tin-glazed pottery imported from Seville.[3]
Tin glaze gives artists a brilliant white, opaque surface to paint over, a medium that was also adopted by the Della Robbia family of Florentine sculptors. The colours are applied as metallic oxides to the unfired glaze, which absorbs pigment like fresco, making errors impossible to fix, but preserving the brilliant colors of the Renaissance in a way that paintings cannot. Maiolica thus requires a second firing, and in the case of lustred wares, yet a third, at a lower temperature. Kilns required wood, only to be found on hillsides, at ever higher altitudes, and a source of suitable clay. Materials for glazes usually had to be imported.
Blue and white vase with oak-leaf decor, Florence, 1430 (Louvre Museum)The fifteenth-century wares that initiated maiolica as an artform were the product of a long technical evolution, in which medieval lead-glazed wares were improved by the addition of tin oxides, under the initial influence of Islamic wares imported through Sicily.Such archaic waresare sometimes dubbed "proto-maiolica. During the later fourteenth century the limited palette of colours was expanded from the traditional manganese purple and copper green to embrace cobalt blue, antimony yellow and iron-oxide orange. Sgraffito wares were also produced, in which the white tin-oxide slip was decoratively scratched to produce a design from the revealed body of the ware: sgraffito wasters excavated at kilns in Bacchereto and Montelupo as well as at Florence show that such wares were produced more widely than at Perugia and Città di Castello, their traditional attributions.
Refined production of tin-glazed earthenwares made for more than local needs was concentrated in central Italy from the later thirteenth century, especially in the contada of Florence. The city itself declined in importance in the second half of the fifteenth century, perhaps because of local deforestation, while the production scattered among small communes and, after mid-fifteenth century, at Faenza. Significantly, in a contract of 1490twenty-three master-potters of Montelupo agreed to sell the year's production to Francesco Antinori of Florence; Montelupo provided the experienced potters who were set up in 1495 at the Villa Medicea di Cafaggiolo by its Medici owners. Florentine wares spurred characteristic productions in the fifteenth century at Arezzo and Siena.
Istoriato decor on a plate from Castel Durante, c 1550-1570 (Musée des Beaux-Arts de Lille)In Romagna, Faenza, which gave its name to faience, produced fine maiolica from the early fifteenth century; it was the only fair-sized city in which the ceramic industry became a major economic component. Bologna produced lead-glazed wares for export. Orvieto and Deruta both produced maioliche in the fifteenth century. In the sixteenth century, maiolica production was established at Castel Durante (illustration, right), Urbino, Gubbio and Pesaro. Some maiolica was produced as far north as Padua, Venice and Turin and as far south as Palermo and Caltagirone in Sicily. In the seventeenth century Savona began to be a prominent place of manufacture.
The variety of styles that arose in the sixteenth century all but defies characterization.Italian cities encouraged the start of a new pottery industry by offering tax relief, citizenship, monopoly rights and protection from outside imports.
An important mid-sixteenth century document for the techniques of maiolica painting is the treatise of Cipriano Piccolpasso, not a professional potter himself. Individual sixteenth-century masters like Nicola da Urbino, Francesco Xanto Avelli, Guido Durantino and Orazio Fontana of Urbino, Maestro Giorgio of Gubbio and Maestro Domenigo of Venice all deserve individual treatment.
Some of the principal centers of production (e.g. Deruta and Montelupo) still produce maiolica, which is sold in quantity in Italian tourist areas. Modern maiolica looks different from old maiolica because its glaze is usually opacified with the cheaper zircon rather than tin, though there are potteries that specialise in making authentic-looking Renaissance-style pieces with genuine tin-glaze.
"By a convenient extension and limitation the name may be applied to all tin-glazed ware, of whatever nationality, made in the Italian tradition ... the name faïence (or the synonymous English 'delftware') being reserved for the later wares of the 17th Century onwards, either in original styles (as in the case of the French) or, more frequently, in the Dutch-Chinese (Delft) tradition."[15] The term "maiolica" is sometimes applied to modern tin-glazed ware made by studio potters (as in Osterman's book, see below).
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majolica
The English word, majolica, is also used for Victorian majolica, a different type of pottery with clear, coloured
Victorian Majolica is earthenware pottery made in 19th century Britain and the USA with molded surfaces and colorful clear lead glazes.
It was originated by Mintons Ltd, who exhibited it at the Great Exhibition of 1851 under the name Palissy ware. The debt to the eccentric 16th potter Bernard Palissy is obvious from its naturalistic plant and animal motifs molded in relief and splashed with bold color and clear glazes. The style is well represented in the pitcher illustrated on the right.
Mintons had for some time been making tin-glazed pottery (which is opaque, white and shiny and painted in color) somewhat in the style of Renaissance Italian maiolica, which they called majolica ware, anglicizing the Italian maiolica.
The Illustrated London News reported with approval of Minton's work at the Paris Exposition Universelle (1855) :
The collection of Palissy and Majolica ware, however, is that which appears to have created the greatest sensation among Parisian connoisseurs. The reader will remember that the main difference in these wares is that whereas the Palissy ware is coloured by a transparent glaze, Majolica ware contains the colour (opaque) in the material. The care and taste with which these manufactures have been brought by the Messrs. Minton to their present state of perfection, have been amply rewarded. Within a few days of the opening of the Exhibition all the specimens exhibited had been sold.
Despite this reminder, the public came to call Minton's Palissy Ware majolica ware; Palissy ware dropped out of use and majolica stuck. In the 1880s, the curators of the South Kensington Museum (now the V&A) tried to clear up the confusion by reviving the Italian pronunciation maiolica for Italian tin-glaze.(see above)
Wedgwood began to manufacture majolica about ten years after Mintons. Wedgwood's glazes and modeling were denser and more formal than Minton's, but there were many pieces that displayed the naturalism and humor of Minton shapes. Wedgwood's majolica included cachepots, pitchers, candlesticks, cheese bells, umbrella stands, sardine boxes, plates in naturalistic patterns, bread trays, etc. In Wedgwood's familiar "greenware" the green glaze emphasizes the low relief patterning, typically of basketwork and foliage.
Majolica was influenced by the design of the old "Cauliflower" and "Pineapple" teapots made by Whieldon, Wedgwood and other 18th-century Staffordshire potters. Both English and American majolica potters reproduced the "Cauliflower" pattern and other raised fruit, vegetable, leaf, and berry patterns, with green, yellow, pink, brown, light blue and purple-blue glazes. There is also a teapot of yellow corn and green leaves, similar to the old Whieldon "Pineapple" teapots, and a teapot, pitcher and sugar bowl of pink coral and green seaweed with accents of brown and blue, marked "Etruscan Majolica." Many late 19th-century majolica designs had rustic motifs with backgrounds of basketry and wooden-bound buckets decorated with molded flowers, birds, fish and animals. Handles were made like rustic tree branches, rose stems and twined flowers and leaves.
Plates, jugs, teapots, and other articles were molded with the shapes of wild roses, lily pads and herons, begonia leaves, shells, coral, seaweed, corn and bamboo stalks, cabbage leaves, strawberries, ferns and sprays of flowers, borders of basketry and oriental motifs.
Many potteries responded to the popularity of majolica.
The Trent Pottery, George Jones and Sons, made majolica cupids, shells, dolphins, and coral designs in numerous shapes. Their mark was a monogram of the initials "G.J." joined together. A beehive bread dish with a cover has a design of wild roses against a background of basketwork and has the Trent Pottery mark. Also flowerpots were made in bright colors and with raised designs of natural flowers.
T. Furnival and Sons made jugs and plates with raised oriental designs, which had borders of wickerwork in bold color and glaze. Their mark, "Furnival," is impressed in the ware.
Edward Steele of Hanley manufactured jugs, flower vases, teapots, dessert services also made majolica, and centerpieces with fine coloring.
Edward Banks and Thomas Thorley of Hanley manufactured bread trays, cheese stands, jugs, dessert services, trays, teapots, egg- holders and flowerpots. One of their dessert services has a chocolate colored ground and a raised naturalistic design of ivy, ferns, and anemones.
Davenport and Banks (or Davenport Beck and Company) made many varieties of majolica. Their work was marked with a castle and the letters "D.B. & Co. Etruria" within an oval garter bearing the words "Trade Mark."
Joseph Holdcroft of Longton.
Poole and Unwin.
S.Fielding and Co., The Railway Pottery, Stoke on Trent
Daniel Sutherland and Sons.
James Woodward
J.W. John Adams and Co. of Hanley
Several American firms also made majolica, the best known of whom are Griffin, Smith and Hill of Phoenixville, Pennsylvania. Their Etruscan majolica made from 1880 to 1890 includes compotes with dolphin supports and flower, shell, or jewel cups, a design of coral weed and seashells, and tableware with leaves and ferns. Their mark was an impressed monogram, "G.S.H.," sometimes circled and with the words "Etruscan Majolica".
Majolica was also made by Odell and Booth at Tarrytown, New York, and by the Faience Manufacturing Company at Greenpoint, Long Island, whose mark is an incised "F.M. Co." Their pottery was dipped in colored glazes, creating a streaked or marbled effect. Majolica was made at Evansville, Indiana. Work from the Chesapeake Pottery in Baltimore was called Clifton Ware and was marked "Clifton Decor 'R' " with the monogram "D.F.H.".
The Arsenal Pottery of Trenton, New Jersey, was making majolica as late as 1900 and exhibited Toby jugs in imitation of English Toby jugs at the World's Columbian Exposition, Chicago (1893)
Production had increased since 1875 but with fewer original examples and with less artistic enterprise. By the death of Queen Victoria in 1901, majolica production was at an end, superseded by Art Nouveau and Art Pottery.
Much Victorian majolica appears in antique shops and auctions. It is popular with collectors and many of the old patterns have been reproduced.
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What is Chinese Porcelain?
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Chinese porcelain is hard paste made using china clay and Chinese porcelain stone, baidunzi. While rim chips and hairline cracks are common, pieces tend not to stain. Chinese wares are usually thinner than Japanese and do not have the Japanese stilt marks.
Wares from the 16th century include Kraak porcelain, Yixing stonewares , Blanc-de-Chine, Blue and white, Famille verte, noire, jaune and rose, Chinese Imari, Armorial wares and Canton porcelain. Chinese export porcelain is generally decorative, but without the symbolic significance of wares produced for the home market. With the exception of the rare Huashi soft paste wares.
In the 16th century, Portuguese traders began importing late Ming dynasty blue and white porcelains to Europe, resulting in the growth of the Kraak porcelain trade (named after the Portuguese ships called carracks in which it was transported). In 1602 and 1604, two Portuguese carracks, the San Yago and Santa Catarina, were captured by the Dutch and their cargos, which included thousands of items of porcelain, were auctioned, igniting a European mania for porcelain. Buyers included the Kings of England and France. Many European nations then established trading companies in the Far East, the most important being the Dutch East India Company or VOC. The trade continued until the mid-17th century when civil wars caused by the fall of the Ming dynasty in 1644 disrupted suppliers and the European traders turned to Japan.As valuable and highly-prized possessions, pieces of Chinese export porcelain appeared in many seventeenth-century Dutch paintings.
Under the Kangxi reign (1662-1722) the Chinese porcelain industry at Jingdezhen was reorganised and the export trade was soon flourishing again. Chinese export porcelain from the late 17th century included Blue and white and Famille verte wares (and occasionally Famille noire and jaune). Wares included garnitures of vases, dishes, teawares, ewers, and other useful wares, figure models, animals and birds. Blanc-de-Chine porcelains and Yixing stonewares arrived in Europe giving inspiration to many of the European potters.
For the potters of Jingdezhen the manufacture of porcelain wares for the European export market presented new difficulties. Writing from the city in 1712 the French Jesuit missionary Père Francois Xavier d'Entrecolles records that "...the porcelain that is sent to Europe is made after new models that are often eccentric and difficult to reproduce; for the least defect they are refused by the merchants, and so they remain in the hands of the potters, who cannot sell them to the Chinese, for they do not like such pieces".
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What is faience?
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Faience- Lightly fired earthenware that is painted, then covered with a glaze of tin oxide. When fired the glaze produces an opaque, white surface. Similar in look to majolica, faience flourished in French potteries during the 17th and 18th centuries. Trade declined after the French Revolution, when lighter, cheaper, and less fragile English pottery flooded the market.
Faience- Lightly fired earthenware that is painted, then covered with a glaze of tin oxide. When fired the glaze produces an opaque, white surface. Similar in look to majolica, faience flourished in French potteries during the 17th and 18th centuries. Trade declined after the French Revolution, when lighter, cheaper, and less fragile English pottery flooded the market.
Faience or faïence is the conventional name in English for fine tin-glazed pottery on a delicate pale buff body.The invention of a pottery glaze suitable for painted decoration, by the addition of an oxide of tin to the slip of a lead glaze, was a major advance in the history of pottery. The invention seems to have been made in Iran or the Middle East before the ninth century, and there have even been records of the invention as far back as 1200 B.C.E. These discoveries were made in Knossos, Crete in the form of foot-tall Snake Goddess statuettes. A kiln capable of producing temperatures exceeding 1000°C was required to achieve this result (see pottery), the result of millennia of refined pottery-making traditions.
Technically, lead-glazed earthenware, such as the French sixteenth-century Saint-Porchaire ware, does not properly qualify as faience, but the distinction is not usually maintained.
Faience is more correctly defined as Egyptian faience, in order to differentiate it from the ambiguous term frit and a type of pottery now know as majolica: a tin glazed ware originally produced in Faenza in northern Italy.Egyptian faience, both locally produced and exported from Egypt, occurs widely in the ancient world, and is well known from Mesopotamia, the Mediterranean and in northern Europe as far away as Scotland.
Faience in the Western Mediterranean
The Moors brought the technique of tin-glazed earthenware to Al-Andalus, where the art of metallic glazes was perfected. From Andalusia it was exported, either directly or via the Balearic Islands[2] to Italy. In Italy, locally produced tin-glazed earthenwares, initiated in the fourteenth century, reached a peak in the late fifteenth and early sixteenth centuries, represented by the Italian faience called Majolica. The name faience is simply the French name for Faenza, in the Romagna near Ravenna, Italy, where a painted majolica ware on a clean, opaque pure-white ground, was produced for export as early as the fifteenth century.
"Majolica" (pronounced and also spelled "maiolica") is a garbled version of "Maiorica", for the island of Majorca, which was a transshipping point for refined tin-glazed earthenwares shipped to Italy from the kingdom of Aragon in Spain at the close of the Middle Ages. This type of Spanish pottery owed much to its Moorish inheritance.
French and northern European faïence
The first northerners to imitate the tin-glazed earthenwares being imported from Italy were the Dutch. Delftware is a kind of faience, made at potteries round Delft in Holland, characteristically decorated in blue on white, in imitation of the blue-and-white porcelain that was imported from China in the early sixteenth century, but it quickly developed its own recognisably Dutch décor.
"English Deltware" produced in Lambeth, London, on the south bank of the Thames, and at other centers from the late sixteenth century, provided apothecaries with jars for wet and dry drugs. Many of the early potters in London were Flemish. By about 1600, blue-and-white wares were produced, labelling the contents within decorative borders. The production was slowly superseded in the second half of the eighteenth century with the introduction of cheap creamware.
Dutch potters in northern (and Protestant) Germany established German centres of faience: the first manufactories in Germany were opened at Hanau (1661) and Heusenstamm (1662), soon moved to nearby Frankfurt-am-Main.
Faience of LunévilleIn France, centres of faience manufacturing developed from the early eighteenth century led in 1690 by Quimper in Brittany[1], which today possesses an interesting museum devoted to faience, and followed by Rouen, Strasbourg and Lunéville.
The products of faience manufactories, rarely marked, are identified by the usual methods of ceramic connoisseurship: the character of the body, the character and palette of the glaze, and the style of decoration, faïence blanche being left in its undecorated fired white slip. Faïence parlante bears mottoes often on decorative labels or banners. Wares for apothecary, including albarello, can bear the names of their intended contents, generally in Latin and often so abbreviated to be unrecognizable to the untutored eye. Mottoes of fellowships and associations became popular in the 18th century, leading to the Faïence patriotique that was a specialty of the years of the French Revolution.
By the mid-18th century, glazed earthenware made in Liguria was imitating decors of its Dutch and French rivals (Musée des Beaux-Arts de Lille)In the course of the later 18th century, cheap porcelain took over the market for refined faience; in the early 19th century, fine stoneware—fired so hot that the unglazed body vitrifies—closed the last of the traditional makers' ateliers even for beer steins. At the low end of the market, local manufactories continued to supply regional markets with coarse and simple wares.
Faïence revival
In the 1870s, the Aesthetic movement, notably in Britain, rediscovered the robust charm of faience, and the large porcelain manufactories marketed revived faience, such as the "Majolica ware" of Minton and of Wedgwood.
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What is armorial ware or armorial porcelain?
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Armorial ware are ceramics decorated with a coat of arms. Armorials have been popular on European pottery from the Renaissance with examples seen on Italia Maiolica, Slipware, English and Dutch Delft, and on porcelain from the 18th century.
The term is most often associated, however, with Chinese export porcelain, often decorated with the arms and crests of Europeans and Americans from the late 17th century through the 19th century.
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What is Imariware or Imari ware?
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Imari porcelain is the European collectors' name for Japanese porcelain wares made in the town of Arita, in the former Hizen Province, northwestern Kyūshū, and exported from the port of Imari, Saga, specifically for the European export trade.
Imari was simply the trans-shipment port for Arita wares. The kilns at Arita formed the heart of the Japanese porcelain industry, which developed in the 17th century, after the white kaolin clay was discovered in 1616 by abducted Korean potter Yi Sam Pyong (Yi Sam-p'young; 1579-1655). Yi Sam Pyong was kidnapped along with several thousand other Korean artisans by Japanese invaders during the Seven Year War (Imjinwaelan) of 1592-1598. Arita soon came to rival the output of the Chinese kilns at Ching-te-Chen. Blue-and-white porcelain made at Arita was also widely exported to Europe through the Dutch East India Company, but "Imari porcelain" connotes Arita wares more specifically designed to catch the European taste.
Though sophisticated wares in authentic Japanese styles were being made at Arita for the fastidious home market. European export porcelains imitated Chinese underglaze blue decors ("blue-and-white" wares) or made use of enamel colors over underglazes of cobalt blue and iron red. The ware often used copious gilding, sometimes with spare isolated sprigged vignettes, but often densely patterned in compartments. There were two quite different styles in these wares. "On the one hand a gaudy, brash brightly coloured and highly decorated style, the Imari style" Globular Imari teapots with swan-necked spouts helped establish the classic European form for these new necessities of life.
Early experiments with overglaze colored enamels at Arita are associated with the famous Sakaida Kakiemon (1596-1666), whose name is memorialized in "Kakiemon" ware, the other main tradition in enamel decors. Dutch traders had a monopoly on the insatiable export trade, the first large order being placed at Arita by the Dutch East India Company in 1656. The trade peaked in the late 17th century and was slowly replaced by Chinese kilns in the early 18th century, as social conditions in China settled with the full establishment of the Qing Dynasty. Very fine "Chinese Imari" export wares were produced in the 18th century, eclipsing the original Japanese exports.
Chinese Imari patterns, as well as "Kakiemon" designs and palette of colors, influenced some early Orientalizing wares produced by the porcelain manufactories at Meissen, or later at Vincennes.
European centers imitated the style of "Imari" wares, initially in faience at Delft in Holland, and in the early 19th century at Robert Chamberlain's factory at Worcester
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