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:

A photographic process using iron salts and producing an image in Prussian blue. For the resulting prints, use "blueprints" if they are reproductions of technical drawings, or "cyanotypes" if they are camera images or photograms.