Chinese porcelain began to be exported to Europe by the Portuguese and later by the Dutch from the middle of the 16th century, creating vast demand for the material. The discovery in Europe of the secret of its manufacture has conventionally been credited to Johann Friedrich Böttger of Meissen, Germany in 1708, but it has also been claimed that English manufacturers or Ehrenfried Walther von Tschirnhaus produced porcelain first. Certainly, the Meissen porcelain factory, established 1710, was the first to produce porcelain in Europe in large quantities and since the recipe was kept a trade secret by Böttger for his company, experiments continued elsewhere throughout Europe. Vienna porcelain became the second European manufacturer in 1718, followed by Vezzi porcelain in Venice in 1720.