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Modelling Clay That Never Hardens: Kaolin Kneaded with Petroleum Jelly (Lanza, US 861,294, 1907)
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Charlie

31. uMfumfu 2026DE
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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.
Oqalayo
1 hour

Imiyalelo

1

Sift the clay fine

Use clay ground fine enough to pass a 100-mesh screen, better 200 mesh. Lanza used kaolin with good results.

Izinto zokwakha zalesi sinyathelo:

Impuphu yobumba be-kaolinImpuphu yobumba be-kaolin5 parts

Amathuluzi adingekayo:

Isisefo Senetha EcolekileIsisefo Senetha Ecolekile
2

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.

Izinto zokwakha zalesi sinyathelo:

I-vaselineI-vaseline2 parts

Amathuluzi adingekayo:

Isikali sesilinganisoIsikali sesilinganiso
3

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.

Izinto zokwakha zalesi sinyathelo:

Impuphu yesibabuleImpuphu yesibabule1 a little, if sticky

Amathuluzi adingekayo:

Isigqulo NomgquloIsigqulo Nomgqulo

Izinto

3

Amathuluzi Adingekayo

3

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