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
Edmé Samson what reason the Samson marks might have been removed. However, during the same period, other companies, such as Jacob Petit of Fontainebleau, were producing reproductions similar to those created by the Samson firm. In Hungary the Herend company produced famille rose pieces and armorial plates. However, unlike the Samson firm’s marks, Herend utilized both impressed marks and painted ones, which cannot be erased or removed. The Samson, Edmé et Cie company continued to produce porcelain and pottery until 1969. The salesroom models were sold in 1979 by Christie's, London. Today many of the Samson’s pieces are collectors’ items. Ironically not