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. dye
8. [dye by composition or origin]
9. synthetic dye

Anotations

Scope note:

Any of a large class of usually red synthetic dyes, which are obtained typically by coupling of diazotized aromatic monoamines with aromatic diamines, or any of various mixtures of safranine salts used in dyeing and as biological stains.