Bone Ash

"Ground calcined 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 oxde 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."
-The Potter's Dictionary of Materials and Techniques

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An important source of calcium phosphate made from calcined cattle bones. Real bone ash is chemically inert and free of organic matters. Calcium acts as a flux, and phosphorous as a glass former.

Similar to Bone Ash. Will work well in high or low temperature glazes. A white amorphous powder. Insoluble in cold water, decomposes in hot water. When used in most glaze bases (8-15%) will produce a lava effect at Cone 06.