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There is a distinction between hard-paste porcelain, fired at 1400 degrees Celcius, and soft-paste porcelain, fired at 1200 degrees Celcius. Bone china is soft-paste procelain made from bone ash and kaolinite.
The raw materials for porcelain are when mixed with water and form a plastic paste. The paste is worked to a required shape before firing in a kiln.
Porcelain originated in China, and 'china' is the common name of the prduct. By the Eastern Han Dynasty period (196–220 AD) glazed ceramic wares had developed into porcelain. Porcelain manufactured during the Tang Dynasty (618–906 AD) was exported to the Islamic world, where it was highly prized. Early porcelain of this type includes the tri-colour glazed porcelain, or sancai wares. Porcelain items in the sense that we know them today could be found in the Tang Dynasty, and archaeological finds have pushed the dates back to as early as the Han Dynasty (206 BC – 220 AD). By the Sui Dynasty (581–618) and Tang Dynasty (618–907), porcelain was widely produced.
In 1712, many of the Chinese porcelain secrets were revealed in Europe by the French Jesuit father Francois Xavier d'Entrecolles, and published in Lettres édifiantes et curieuses de Chine par des missionnaires jésuites.
Early in the 16th century, Portuguese traders returned home with samples of kaolin clay, which they discovered in China to be essential in the production of porcelain wares. However, the Chinese techniques and composition used to manufacture porcelain were not yet fully understood.
In the German state of Saxony, the search concluded in 1708 when Ehrenfried Walther von Tschirnhaus produced a hard, white, translucent type of porcelain with kaolin clay and alabaster, mined from a Saxon mine in Colditz. It was a closely guarded trade secret of the Saxon enterprise.
Von Tschirnhaus and his assistant Johann Friedrich Böttger were employed by Augustus the Strong and worked at Dresden and Meissen in Saxony. A workshop note records that the first specimen of hard, white and vitrified European porcelain was produced in 1708. At the time, the research was still being supervised by Tschirnhaus, but he died in October of that year. Böttger reported to Augustus in March 1709 that he could make porcelain. He usually gets the credit for the European discovery of porcelain.
The first important French soft-paste porcelain was made at the Saint-Cloud factory before 1702. Soft-paste factories were established at Chantilly in 1730 and at Mennecy in 1750. The Vincennes porcelain factory was established in 1740, moving to larger premises at Sèvres. in 1756. Vincennes soft-paste was whiter and more perfect than any of its French rivals, which put Vincennes/Sèvres porcelain in the leading position in France.
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 took out a patent on a porcelain containing bone ash. This was the first bone china, subsequently perfected by Josiah Spode.
In the twenty-five years after Briand's demonstration, half a dozen factories were founded in England to make soft-paste table-wares and figures. Some famous factories were:
- Chelsea (1743)
- Bristol porcelain (1748)
- Royal Crown Derby (1750 or 1757)
- Royal Worcester (1751)
- Wedgwood (1759)
- Spode (1767)
William Cookworthy discovered deposits of kaolin clay in Cornwall. This helped the development of porcelain and other whiteware ceramics in England. Cookworthy's factory at Plymouth, 1768, used kaolin clay and china stone. He made porcelain with a composition similar to the Chinese porcelains of the early 18th century.
- Glaze, glazing: vitreous (glass-like) enamel, or porcelain enamel, is made by fusing powdered glass to a substrate by firing. The powder melts, flows, and then hardens to a smooth, durable vitreous coating on ceramics, metal, or glass.
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- China stone: a medium grained, feldspar-rich partially decomposed granite.