Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. [processes and techniques by material]
6. hide and skin processing
7. [tanning and tanning-like processes]

Anotations

Scope note:

Treating skins or hides with brain tissue which contains phosphorous compounds that oxidize oils to aldehydes. The process is not considered true tanning, as it is reversible, and the shrinkage temperature of the resulting material is not raised above that of the original.