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. yellow pigment
10. synthetic organic yellow pigment

Anotations

Scope note:

Dull yellow-brown, transparent pigment created when precipitated on an inert base from crystallized orange-brown needles made from a dilute glacial acetic acid solution. Developed in 1887 by R. Nietzki, it became the first azo mordant dye.