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Modelling Clay That Never Hardens: Kaolin Kneaded with Petroleum Jelly (Lanza, US 861,294, 1907)
Clay mixed with water dries, cracks and needs wetting all the time. Lanza bound fine clay with petroleum jelly instead, so it stays soft and workable for good.
Result: a clean, non-hardening modelling clay; the more petroleum jelly, the softer it is.
Source: Lanza, US 861,294 (1907). Not given: batch size, kneading time. Picture drawn by Youblob.
初学者
1 hour
说明
1
1
Sift the clay fine
Sift the clay fine
Use clay ground fine enough to pass a 100-mesh screen, better 200 mesh. Lanza used kaolin with good results.
此步骤所需材料：
高岭土粉5 parts所需工具：
细目筛2
2
Weigh 2 parts jelly to 5-7 parts clay
Weigh 2 parts jelly to 5-7 parts clay
By weight: 2 parts petroleum jelly to 5-7 parts clay. Ratio: more jelly (2:5) gives a softer clay, less (2:7) a firmer one.
此步骤所需材料：
凡士林2 parts所需工具：
等臂天平3
3
Knead them together
Knead them together
Mix the clay and jelly intimately until smooth. If the clay sticks to the fingers, work in a little sulfur as a filler.
此步骤所需材料：
硫磺粉1 a little, if sticky所需工具：
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