Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by function]
6. photographic materials
7. photographic media
8. photographic film (photographic materials)

Anotations

Scope note:

Film that is sensitized to invisible infrared wavelengths. It is used in aerial photography to cut through atmospheric haze (which scatters blue light but not infrared rays) and for special purposes in scientific and forensic photography. First developed in 1919.