Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by origin]
6. residue materials
7. ash (residue)

Anotations

Scope note:

A white ash composed chiefly of phosphate of lime; obtained by burning bones in air. Bone ash is used in cleaning jewelry; bone ash cupels have been related in Medieval and later archaeological contexts to the refining of noble metals in alchemy, assaying, jewelry, and coin minting.