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Hard-paste porcelain

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Español: :porcelana; porcelana dura; la porcelana china original.


Hardpasteporcelain.jpg

Porcelain dish, Chinese Qing, 1644 - 1911, Hard-paste decorated in underglaze cobalt blue V&A Museum no. 491-1931[1] Victoria and Albert Museum, London

Hard-paste porcelain is a ceramic material that was originally made from a compound of the feldspathic rock petuntse and kaolin fired at very high temperature. It was first made in China around the 9th century.

Historically, "hard-paste" referred to the Asian porcelains that had been prepared from the aforementioned raw materials. The secret of its manufacture was not known in Europe until 1709, when Johann Friedrich Böttger of Meissen, Germany discovered the formula. Despite attempts to keep it secret, the process spread to other German ceramic factories and eventually throughout Europe.

Lettre du pere Entrecolles 1712 du Halde 1735.jpg

Letter of Francois Xavier d'Entrecolles about Chinese porcelain manufactuting techniques, 1712, published by du Halde in 1735.

From 1712, the French Jesuit Francois Xavier d'Entrecolles described the Chinese process of manufacturing porcelain in his letters to Europe. Hard-paste, or just hard porcelain, now chiefly refers to formulations prepared from mixtures of kaolin, feldspar and quartz. Other raw materials can also be used and these include pottery stones, which historically were known as petunse although this name has long fallen out of use[2]. Hard-paste porcelain is now differentiated from soft-paste porcelain mainly by the firing temperature, with the former being higher, to around 1400°C, and the latter to around 1200°C.[3][4] Depending on the raw materials and firing methods used, hard-paste porcelain can also resemble stoneware or earthenware. Hard-paste porcelain can be utilized to make porcelain bisque, a type of porcelain. It is a translucent and bright, white ceramic. With it being almost impermeable to water it is unnecessary to glaze the body. Manufactures include Lladro, Hummel and Royal Worcester.

See alsoEditar

ReferencesEditar

  1. Porcelain dish. Ceramics. Victoria and Albert Museum. Retrieved on 2007-12-06.
  2. ‘Chinese Porcelain’. N.Wood. Pottery Q. 12, (47), 101, 1977
  3. Singer, F. and Singer, S.S., Industrial Ceramics (Chapman Hall, 1963) .
  4. Rado, Paul, An Introduction To The Technology Of Pottery (Pergamon Press, 1988) .

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