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:

Sodium dithionite (also known as sodium hydrosulfite) is a reductive bleaching chemical. Usage includes iron stain removal, and occasionally to treat corroded copper and silver artifacts in object conservation. It can also be used for purification of water and gas and as a sulfonating agent or a sodium ion source in industrial processes.