Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. organic material
7. formaldehyde

Anotations

Scope note:

Aqueous formaldehyde solution containing 37% by weight of formaldehyde. In conservation it has been used as a fluid preserving medium, and, as an aerosol and fumigant, to treat algae on stone at sites such as the Lascaux caves. Formerly a brand name, now in common usage.