Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by function]
6. colorant (material)
7. pigments
8. [pigment by color]
9. blue pigment
10. inorganic blue pigment

Anotations

Scope note:

The end-product of the refining process that is used to produce natural ultramarine blue pigment from lapis lazuli, ultramarine ash remaining after higher grades of ultramarine blue have been extracted. Ultramarine ash contains small blue particles mixed with a large proportion of colorless materials, such as calcite and silicates; it has been used for glazing.