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:

A highly corrosive, caustic, and toxic water solution of hydrogen fluoride that dissolves most metals, except gold, platinum, glass, ceramics, and organic material; used for etching glass and cleaning metals.