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. [colorant for dye and pigment]

Anotations

Scope note:

Synthetic form of dihydroxyanthraquinone (alizarin) made from anthracene, a coal tar product, in 1868 by Carl Graebe and Carl Lieberman. Prior to that time, alizarin was obtained from the root of the madder plant.