The German Meissen porcelain had developed hard-paste porcelain by 1708, and later German factories usually managed to find the secret out from former Meissen employees, beginning with Vienna porcelain in 1718. The other European countries had much longer to wait, but most factories eventually switched from soft to hard-paste, having discovered both the secret and a source of kaolin. In France kaolin was only found in Limousin in 1768, and Sèvres produced both types from 1769, before finally dropping soft-paste in 1804. In England there was a movement in a different direction, as Spode's formula for bone china, developed in the 1790s, was adopted by most other factories by about 1820. By that point little soft-paste porcelain was being made anywhere, and little hard-paste in England, with Nantgarw and Swansea in Wales among the last factories making soft-paste.