Meissen porcelain further precaution, very few workers knew the special secret ("arcanum") of how to make porcelain, and then perhaps only part of the process. Thus, for a few years, Meissen retained its monopoly on the production of hard-paste porcelain in Europe. By 1717, however, a competing production was set up at Vienna, as Samuel Stöltzel sold the secret recipe, which involved the use of kaolin, also known as china clay. By 1760 about thirty porcelain manufacturers were operating in Europe, most of them, however, producing frit based soft-paste porcelain. In order to identify the original Meissen products, Meissen developed markings that
Chinese ceramics "Yangcai" (洋彩), meaning 'foreign colours') was introduced during the reign of the Kangxi Emperor (1654–1722), possibly around 1720. It used mainly pink or purple and remained popular throughout the 18th and the 19th centuries, also being widely adopted by European factories. Famille rose enamel ware allows a greater range of colour and tone than was previously possible, enabling the depiction of more complex images, including flowers, figures and insects. Pottery classified as stoneware in the West is usually regarded as porcelain in Chinese terms, where a stoneware group is not recognised, and so the definition of porcelain is rather different,