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. mineral

Anotations

Scope note:

Yellow surface coating of friable material that forms on unprotected realgar exposed to light; this light-induced transformation product is found occasionally in paintings in association with the pigment. In the past, pararealgar has been confused with the pigment orpiment to which this sulfide arsenic mineral is closely related.