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. natural dye
10. vegetable dye

Anotations

Scope note:

A natural purple colorant and dye obtained from the seeds of Chrozophora tinctoria. It is not lightfast. Turnsole is an acid-base indicator dye that is red in acid and blue to violet in alkalis. It was used as a violet watercolor pigment in 14th century Italian manuscripts and as a purple textile dye from medieval times to the 17th century. It is used as a food colorant, as in Dutch cheese and certain liquors.