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
French porcelain about a decade later by styles leading to Art Deco. The display of Sèvres porcelain in the English Country House is another by-product of the 19th century and flourishes especially within what is known as 'Rothschildshire' (the county of Buckinghamshire). The family's history of collecting and its development of the distinctive ‘goût Rothschild’ (Rothschild style) results in some of the most iconic Sèvres being located at Waddesdon Manor, Baron de Rothschild's weekend 'pleasure house'. As Mark Girouard denotes, "opulence was the key-note of this" and thus "eighteenth-century French furniture, porcelain and bronzes of superb quality combined" dominated this specific 19th-century