Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Visual and Verbal Communication (hierarchy name)
4. Exchange Media (hierarchy name)
5. exchange media (objects)
6. money (objects)
7. [money by material]
8. trade beads

Anotations

Scope note:

Tubular trade beads of West Africa, known from the 15th century, of different and variegated colors though the most highly prized were blue with a greenish translucence. Their manufacture and component material is uncertain.