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. red pigment
10. synthetic inorganic red pigment

Anotations

Scope note:

Synthetically produced brick red color iron oxide artists' pigment. Originally, the name "Indian red" was used for red earth pigments imported from the Persian Gulf and India; in the early 18th century, a synthetic Indian red composed of pure ferric oxide was made from steel mill wastes. It is a dense, opaque, permanent pigment.