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:

The salt of formic acid, sodium formate is used as a neutral buffering agent. It sometimes appears spontaneously as a layer of white crystalline efflorescence on sodium-rich glass artefacts exposed to the pollutant gas formaldehyde.