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. copying
7. reprographic processes
8. light-sensitive reprographic processes

Anotations

Scope note:

Process used to duplicate maps and technical drawings employing a ferric salt to insolubilize a gelatin master selectively by light exposure, making the image areas receptive to ink. Allows production of exact copies having sharp lines in printing ink.