Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by property]
6. acid

Anotations

Scope note:

Refers to a strong organic acid derived from sorrel and other plants. A crystalline powder, oxalic acid lends itself to many commercial applications, principally as a bleaching agent and as a reducing agent to remove tarnish, rust and ink stains. In art manufacture and conservation, further uses include removal of paint and varnish, and cleaning of encrustations from sculptures and paintings.