Bone Ash - Digitalfire
Notes. Bone ash is TriCalcium Phosphate in the form of Hydroxyapatite Ca5(OH)(PO 4)3.This reacts when making bone china to give Anorthite (CaAl 2 Si 2 O 8) and Ca3(PO 4)2. 2*Ca5(OH)(PO 4)3 --> 3*Ca3(PO 4)2 + Ca(OH)2 Real bone ash is obtained by calcining bone up to approximately 1100°C and then cooling and milling.