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 class of synthetic xanthene dyestuffs, chiefly reds, which are obtained by fusing an amino derivative of phenol with phthalic anhydride, used especially in coloring paper and as a biological stain.