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Bone black: a term used to describe a glazing technique in pottery. Bones are burned at a high temperature to obtain bone ash. What is left, after being fired in the kiln, is calcium and phosphorous. It is white in colour. That ash is then mixed with iron or copper during the glazing process before the pottery is fired. The addition of minerals turns the glaze the colour of black. It is a unique finish, not often practised by artisans, and the process is ages old.