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 chemical form]
7. compounds (materials)

Anotations

Scope note:

Chemical compound, originally developed for hair-perming preparations, used in conservation of paleontological artifacts. It is applied in solution to fossil materials for neutralization and removal of sulfates and pyrite oxidation products.