Hard Porcelain Body: Kaolin, Felspar, Flint and Chalk, the Sèvres Paste

Hard porcelain is white kaolin made just fusible enough with ground felspar. Andrew Ure (1839) gives the Sèvres paste: 63–70 parts washed kaolin, 22–15 felspar, about 10 flint powder and 5 chalk, mixed as slips, stiffened on plaster and left to ripen damp for months before it is trodden and used. The picture: centring porcelain paste on the wheel in the Grand Atelier of the Sèvres manufactory.