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Kaolin: China Clay Washed Out of Decomposed Granite
Kaolin, china clay, is granite whose felspar has rotted to a soft white clay. Washed in water, the fine clay stays suspended while sand and mica sink. Andrew Ure (1839) describes the Sèvres way: stir it hard in a cask, let the grit settle a few minutes, run the milky clay off through a very fine sieve and let it settle in covered vats.
The picture: the white china clay pit at Wheal Martyn, Cornwall.
初学者
A day's washing, a week drying
说明
1
1
Dig the rotted granite
Dig the rotted granite
Dig soft, white, crumbling granite where the felspar has turned to clay.
此步骤所需材料：
高岭土原岩（风化花岗岩）50 公斤所需工具：
鹤嘴锄
铁锹
等臂天平2
2
Stir it up in water
Stir it up in water
Put a charge in a barrel, run water in gradually and stir hard in every direction with a bar.
此步骤所需材料：
水100 升所需工具：
木桶
搅拌棒3
3
Settle the grit, run off the clay
Settle the grit, run off the clay
Let it stand a few minutes so sand and mica sink. Pour or draw the milky water off just above the grit, through a very fine sieve, into a covered vat.
所需工具：
细目筛
木制大桶4
4
Settle and siphon
Settle and siphon
Leave the vat until the clay has settled and the water is clear, then siphon the water off. Wash the grit again for more clay.
所需工具：
虹吸软管木制大桶5
5
Dry and powder
Dry and powder
Spread the soft clay on plaster bats to stiffen, then dry it fully. Use it as a lump clay, or crush it fine and sift for kaolin powder. Store it dry.
所需工具：
陶艺石膏垫板
研钵与研杵细目筛
玻璃罐6
6
Your yield
Your yield
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