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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.
高级
Days to mix, months to ripen
说明
1
1
Calcine and grind the felspar
Calcine and grind the felspar
Pick felspar free of dark mica and rust. Heat it red hot in the kiln and quench it so it crumbles, then crush and grind it very fine with water and sift.
此步骤所需材料：
长石块2 公斤
水10 升所需工具：
窑炉
淬火水桶
研钵与研杵
研磨器
细目筛
耐热手套
防尘口罩2
2
Flint powder
Flint powder
Calcine and quench flint the same way and grind it to a fine powder with water.
此步骤所需材料：
燧石结核1 公斤所需工具：
窑炉淬火水桶研磨器细目筛防尘口罩3
3
Weigh and mix the slips
Weigh and mix the slips
Weigh the dry kaolin, felspar, flint and chalk in Ure's proportions, stir each into water and mix them into one smooth slip; pass it through a fine sieve.
此步骤所需材料：
高岭土粉6.65 公斤
碳酸钙（白垩粉）0.5 公斤水15 升所需工具：
等臂天平
木制大桶细目筛4
4
Stiffen on plaster, ripen
Stiffen on plaster, ripen
Pour the slip onto plaster bats to draw the water out without heat. When it is a soft paste, store it covered and damp for months to ripen.
所需工具：
陶艺石膏垫板5
5
Tread and ball it
Tread and ball it
Before use, work the paste hard on the wedging table (Sèvres trod it barefoot) until even, and keep it in damp balls.
所需工具：
揉泥台6
6
Ure's Sèvres paste, scaled
Ure's Sèvres paste, scaled
正在加载 Jupyter 笔记本…
7
7
Limits
Limits
The recipe and handling are Ure's; calcining the flint and the batch size are ours. Grinding flint and felspar makes fine silica dust that harms the lungs over time: grind wet and wear a mask.
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