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What is bone ash?

Bone ash: Description

Bone ash is ground bones, usually cattle bones. It is one source of calcium phosphate; others are phosphorite and apatite. It is used as a flux in bodies where the calcium oxide does the fluxing and the phosphorus oxide acts as a glass-former in the melt and also checks over-rapid fusion. Its stiff glassy character is seen combined with that of feldspar in bone china. Bone china contains 45 – 50% of bone ash. A small amount of carbon remains in bone ash when calcination is controlled and this carbon assists the raw plasticity of the body.

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