Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by origin]
6. biological material
7. animal material
8. processed animal material
9. parchment (animal material)
10. vellum (parchment)

Anotations

Scope note:

Vellum that has been treated to make it transparent. Such treatments involve coating the skin with various substances such as oils, glues, sizes, and potassium carbonate, then stretching it under pressure.