Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by form]
6. [materials by physical form]
7. [fiber and fiber by product]
8. [fiber by product]
9. paper (fiber product)
10. [paper by composition or origin]

Anotations

Scope note:

Tree bark employed historically as writing material for important manuscripts in Assam, India. To write on Sanchipat, a waterproof ink was used, prepared with Silikha seed, Kehraj (a type of grass),ashes and minerals and applied with a bird’s feather. The material and associated technique are now rarely used.