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
Jingdezhen porcelain porcelain, for the Chinese market and as Chinese export porcelain, but its best-known high quality porcelain wares have been successively Qingbai ware in the Song and Yuan dynasties, blue and white porcelain from the 1330s, and the "famille rose" and other "famille" colours under the Qing dynasty. The Mongol Yuan dynasty established a body, the "Fuliang Porcelain Bureau" to regulate production, and the next Ming dynasty established official kilns to produce porcelain for the emperor; Jingdezhen continued to produce Imperial porcelain until the end of Imperial rule. The imperial kilns were situated at Pearl Hill (Zhushan) in Jingdezhen; some scholars