Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. [sodium and sodium compounds]
8. sodium compounds

Anotations

Scope note:

An inorganic compound used in the form of a white crystalline powder used variously as an antioxidant, a disinfectant, and a preservative in foods. In a conservation context, it has been used for removing rust stains from paper.