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. pigment processes
9. bichromate processes
10. oil processes

Anotations

Scope note:

Photographic process that is a variant of the oil process in which the developed silver in a gelatin print is used as a catalyst to tan the gelatin. The untanned highlights become saturated when the print is soaked in water and will resist a greasy ink, while the tanned shadows accept the ink. The original print may be the end product or may be used as a master for transferring the image to another support.