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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.
Intermediate
1 day
Instructions
1
1
Grind and mix
Grind and mix
Grind 100 g of heavy spar and 20 g of bituminous coal slack and mix them very thoroughly.
Materials for this step:
Barite (Heavy Spar)100 gTools needed:
Bituminous Coal
Mortar and Pestle
Balance Scale2
2
Roast
Roast
Roast the mixture in a crucible in the furnace. The coal cakes and runs through the mass, reducing the spar.
Tools needed:
Clay Crucible - Deep
Charcoal Furnace
Leather Gloves3
3
Cool and close it up
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.
Tools needed:
Dark Glass Jars with Airtight LidsLeather GlovesMaterials
1- 100 gPlaceholder
Tools Required
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