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 property]

Anotations

Scope note:

Clear silicate glass that will form permanent three-dimensional color photographic images when subjected to x-rays or ultraviolet light through a negative. Photosensitive glass contains submicroscopic metallic particles; the high energy causes the particles to precipitate out of solution. The image is fixed by heating the glass to 540 C.