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

Anotations

Scope note:

A blue-purple dye known from Biblical references, said to be derived from shellfish, although the source species is debated. Used for priestly garments, the tapestries in the Tabernacle, and tassels attached to a garment, the tallit.