Barium Sulphide: Heavy Spar Roasted with Coal

Barium sulphide is the barium half of lithopone, the white pigment. Thorpe (1912): roast 100 parts of heavy spar with 20 parts of coal slack or charcoal. Caking bituminous coal soaks through the mass and reduces it completely; with charcoal, mix very thoroughly. The roasted mass still holds carbon and some unchanged spar: hot water takes out the barium sulphide. Left in air it turns to carbonate and smells of rotten eggs, so keep it closed. The picture: our own drawing.

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Grind and mix

Grind 100 g of heavy spar and 20 g of bituminous coal slack and mix them very thoroughly.

이 단계의 재료:

중정석(바라이트)100 g

필요한 도구:

역청탄

막자사발과 막자

접시 저울

Roast

Roast the mixture in a crucible in the furnace. The coal cakes and runs through the mass, reducing the spar.

필요한 도구:

깊은 점토 도가니

숯 도가니로

가죽 장갑

Cool and close it up

Let it cool and put it straight into an airtight jar. It holds spare carbon and some unchanged spar; hot water dissolves out the barium sulphide when you use it.

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