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Porcelain was invented in China, perhaps as early as the seventh or eighth century AD. The Chinese use the word ci to mean either porcelain or stoneware, not distinguishing between the two. In the West, porcelain usually refers to high-fired (about 1300º) white ceramics, whose bodies are translucent and make a ringing sound when struck. Stoneware is a tougher, non-translucent material, fired to a lower temperature (1100-1250º).
A number of white ceramics were made in China, several of which might be termed porcelain. The northern porcelains, such as Ding ware, were made predominantly of clay rich in kaolin. In southern China, porcelain stone was the main material. At the imperial kilns at Jingdezhen, Jiangxi province, kaolin was added to porcelain stone; in Fujian province, on the coast and east of Jiangxi, porcelain stone was used alone. The results differed in that northern porcelains were more dense and compact, while southern porcelains were more glassy and 'sugary'.
Ceramics may be fired in oxidizing or reducing conditions (increasing or restricting the amount of oxygen during the process). Northern porcelains were usually fired in oxidation, which results in warm, ivory-coloured glazes. Southern wares were fired in reduction, producing a cool, bluish tinge. An exception to this was blanc de Chine, or Dehua ware, from Fujian province, whose warm ivory hue came from oxidizing firings.