porcelain

Dictionary


  • ceramic ware made of a more or less translucent ceramic

  • Wikipedia


    porcelain figurine]]Porcelain is a type of hard ceramicsceramic material fired at a higher temperature than that used to fire glazed earthenware and stoneware pottery. It is white or off-white in colour, translucent and can be decorated to provide additional colour. Porcelain is made by firing a mixture of materials including China clay and China stone in a kiln at temperatures in the region of 1200 to 1350 degrees Celsius. The resulting material is hard, strong, glassy and durable, but also brittle. The main components of porcelain, China clay (kaolinite) and crushed China stone (a form of feldspar) are found in nature and result from the weathering and decomposition of igneous rocks such as granite and basalt.Clays used for the manufacture of porcelain can be specially formulated to provide high-strength and high-durability. It is also possible to blend clays to obtain a clay body that is ideal for throwing on a potter's wheel. A wide range of porcelain clays is readily available from many specialist suppliers of materials for ceramics.

    Techniques - Porcelain wares may be formed by moulding, by hand-building and in the case of round-wares, by throwing on a potter's wheel. Porcelain ware was produced on the potter's wheel in many historic cultures, including China and Japan. Porcelain has many industrial uses and is also employed to form wares ranging from everyday household crockery to objects of fine art. Many categories of glazes, e.g. celadonceladons, were formulated specifically for their striking effects on porcelain. Modern potters also produce porcelain ware, and generally believe these clay bodies challenge production, firing and glazing skills. From the perspective of the potter the most noticeable difference between porcelain clay and other pottery clays is that it ''wets'' very quickly (small changes in its moisture content can produce large changes in its plasticity) and that it tends to continue to 'move' for longer than other clays, requiring experience in handling to attain optimum results.Porcelain wares are usually coated with a layer of glaze and are often decorated with coloured enamels. As a rule porcelain ware of all types is typically biscuit-fired at around 1000 degrees Celsius (1800 degrees Fahrenheit), and glaze fired (the final firing) at 1300°C (2300°F) or higher, though it should be noted that Chinese porcelain is an exception to this rule.

    Chinese porcelain - ChinaChinese porcelain is made from kaolin and a form of feldspar called petuntse. In the Western tradition ceramics are primarily divided into the categories of earthenware, stoneware or porcelain, depending upon the chemical composition of the clay and the temperature at which the ware matures into a stable crystaline matrix. The Chinese tradition recognises only two primary categories of ceramic, high-fired ''(ci)'' and low-fired ''(tao)''. This can lead to confusion because, for example, in China no distinction is drawn between high-fired stonewares and porcelain. One important result of this is that the property of translucence is carries no weight in the traditional Chinese classification of ceramics. One unusual characteristic of Chinese porcelain is that in the main it is ''green-fired'' or ''once-fired'', which is to say that the body and the glaze are fired together. After the body of a piece is formed and finished it is air-dried, coated with a glaze, dried again and fired. In the high temperature of the kiln the body and the glaze are fused together to become one unit. Chinese enamelled wares are also produced in this way, but the enamels are added after the first, high-temperature, firing and the pieces are sent for a second firing in a smaller, lower-temperature kiln.ceramicstoday.com - Two letters written by Père Francois Xavier d'Entrecolles, a Jesuit missionary (and industrial spy) who lived and worked in Jingdezhen described in detail the methods and materials used in the manufacture of porcelain wares in the later years of the reign of the Kangxi emperor; an important period in the history of Chinese ceramics. In his first letter, dated 1712, d'Entrecolles describes the way in which China stone was crushed, refined and formed into little white bricks known in Chinese as ''petuntse'' or ''baidunzi''. He then goes on to describe the refining of China clay, ''kaolin'' or ''Gaoling'', the preparation of glazes, the stages of forming porcelain wares, glazing and firing. Père d'Entrecolles, explaining his motives for describing what he had seen at Jingdezhen, states that ''"Nothing but my curiosity could ever have prompted me to such researches, but it appears to me that a minute description of all that concerns this kind of work might, somehow, be useful in Europe"'' but in the event his first letter came too late to be of much help in the European search for the secret of making porcelain.In 1743, during the reign of the Qianlong emperor, Tang Ying, the imperial supervisor at Jingdezhen produced a memoir entitled ''"Twenty illustrations of the manufacture of porcelain."'' Unfortunately, the original illustrations have been lost but the text of the memoir may be found seattleartmuseum.org - here, together with photographs replacing the missing illustrations and an additional commentary.

    History - In the context of Chinese ceramics the term ''porcelain'' lacks a universally accepted definition. This in turn has led to confusion about when the first Chinese porcelain was made. Claims have been made for the late Eastern Han period (100 to 200 AD) the Three Kingdoms period (220 to 280 AD) the Six Dynasties period (220 to 589 AD) and the Tang dynasty (618 to 906 AD). A strong body of Chinese scholarly opinion is currently of the view that the the first true porcelain was made in the Chinese province of Zhejiang during the Eastern Han period, but this opinion is controversial. However, Chinese experts emphasise the presence of a significant proportion of China clay as an important factor in defining ''porcelain'' and shards recovered from Eastern Han kiln sites in Zhejiang, estimated to have been fired at a temperature of between 1260 to 1300 degrees Celsius, were found to meet this condition.Jingdezhen, under a variety of names, has been central to porcelain production in China since at least the early Han DynastyHan Dynasty. Earliest techniques were very primitive, barely above the level of standard pottery. By the time of the Southern and Northern Dynasty period, however, techniques and materials had been improved to the point that Jingdezhen clay was refined into porcelain.During the Song and Yuan dynasties porcelain was made at Jingdezhen and other kiln sites in southern China using crushed and refined China stone alone, but by the early eighteenth century China clay was being added to the China stone, in about equal proportions. Porcelain bodies made from China stone fire at a lower temperature, in the region of 1200 degrees Celsius, than those made with a mixture of China clay and China stone, which require firing in the region of 1350 degrees Celsius. China clay when added to the body material produced a porcelain of great whiteness and of great strength. Whiteness, in particular, was a much sought after property of porcelain, especially that used for blue and white wares. The Sui DynastySui and Tang DynastyTang Dynasties introduced high-temperature kilns, resulting in pure, translucent whites, attractive to the eye, as well as a variety of advanced glazing techniques. These improvements produced smooth, durable porcelain ware. The resulting product was often referred to as "false jade".

    See also -
  • Tangshan, Hebei province
  • Canton porcelain
  • Chinese export porcelain
  • Dehua porcelain factories
  • Blanc-de-Chine
  • Famille jaune, noire, rose, verte
  • Swatow ware
  • Yixing clay
  • Kraak porcelain

    Japanese porcelain -
  • Imari porcelain
  • Japanese pottery

    European porcelain - The European porcelain was invented in Dresden and Meissen in Saxony, Germany (Meißen porcelain), in the reign of the Rulers of SaxonyElector Augustus II of PolandAugustus the Strong (1694-1733), where today can also be found the largest porcelain collection in the world. The discovery of white porcelain in 1708 was by Johann Friedrich Böttger. Böttger had training as an apprentice pharmacist, but decided to turn to alchemy. He made the claim that he had discovered the process of making gold, this got the attention of cash wanting Augustus the Strong, who had Böttger tossed in jail. Böttger was forced to work with other alchemists to discover the process to make gold, instead he unearthed the recipe to cure Augustus of his obsession with "White Gold".The EuropeanEuropeans used a soft paste, which makes for weaker porcelain than the Chinese method. To compensate, around 1750 the EnglandEnglish began to use calcined bone ash to strengthen their porcelain, with the resulting material (typically comprising 25% to 50% bone ash) becoming known as bone china.

    Key people and places -
  • Gzhel, Russia
  • Oranienbaum, Russia
  • Dmitry Ivanovich Vinogradov
  • Josiah Wedgwood
  • Limoges, France
  • Lladro, Spain
  • Meißen, Germany
  • Herend, Hungary
  • Pécs, Hungary
  • Porsgrunn, Norway
  • Sèvres, France
  • Worcester, England
  • Delft, Netherlands

    References -
  • Hamer, Frank and Janet Title=The Potter's Dictionary of Materials and Techniques. Publisher=A & C Black Publishers, Limited, London, England Year=Third Edition, 1991 ID=ISBN 0-8122-3112-0

    External links - Chinese Porcelain:
  • liverpoolmuseums.org.uk - Chinese porcelain at the Lady Lever Art Gallery
  • travelchinaguide.com - Jingdezhen attractions
  • chinavista.com - Jingdezhen: Ceramics Metropolis of China
  • china-article.com - Jingdezhen Special Folk Arts Porcelain Research Institute
  • gotheborg.com - Gotheborg.com - Chinese Porcelain Collector's InformationPorcelain - general
  • ceramic-link.de - International Ceramic Directory - providing you with links to ceramic !artists,backstamps,manufacture rs,? historical sites and moreCategory:Chinese !cultureCategory:PotteryCategor y:Saxonyaf:Porseleincs:Porcel nde:Porzellanes:Porcelanaeo:P orcelanofr:Porcelaineio:Porcel anohe:חרסינהnl:Porselein ja:陶磁器pl:Porcelanaru:Ф рфорsl:Porcelanfi:Posliin izh:瓷器
  • Websites


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    Porcelaine Royal Limoges - GDA
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    Linda Agar-Hendrix
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    MEDALLIONS AND BORDERS
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    Auctions house fine art
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    Porcelain Enamel Institute
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    Porcelain Fantasies
    Hand painted porcelain doll house dishes, accessories, and fantasy dolls. Available in 1-inch scale and smaller with custom orders accepted.
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    The Porcelain Pond
    Virginia dealer specializing in antique Haviland Limoge porcelain.
    http://www.porcelainpond.com

    Fragile Porcelain Mice
    Official site for the St. Louis band includes show dates, biography, discography, and merchandise.
    http://www.fragileporcelainmice.com/

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