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 production method]

Anotations

Scope note:

"Mars" is now the common name used for synthetic iron oxide pigments. Mars colors are made from hydrated iron oxide co-precipitated with alum using lime or potash. The proportion of the mixture controls the degree of color; drying the product produces Mars yellow, other colors include orange, red, black, brown, and violet, produced by calcining the yellow. "Mars" was originally a brand name in the late 18th century.