Hierarchy classification:

1. top of the aat hierarchies
2. Activities Facet
3. Processes and Techniques (hierarchy name)
4. [processes and techniques by specific type]
5. [image-making processes and techniques]
6. [photography and photographic processes and techniques]
7. photographic processes
8. iron processes

Anotations

Scope note:

An iron process for making prints using a light-sensitive emulsion of a ferric salt and silver nitrate. When developed, a metallic silver image is formed; various developers can produce black, brown, purple, or maroon tones.