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. glass (material)
8. [glass by composition or origin]
9. ruby glass

Anotations

Scope note:

Glass of a deep red color that is produced by a colloidal gold solution prepared by dissolving gold in aqua regia, sometimes including some tin or silver salts. Gold ruby glass was made by the ancient Egyptians and Romans; the ancient technique was lost until rediscovered in 17th-century Germany. Gold was also thought to be anti-toxic and to protect from poison anyone who drank from it.