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. direct positive processes

Narrower term/s

• heliochromy (daguerreotype process)

Anotations

Scope note:

Process that produces a direct positive image on a silver-coated copper plate, invented by Louis-Jacques-Mandé Daguerre of France and Joseph-Nicéphore Niepce in the 1830s. In the process, a copper plate is coated with silver iodide and exposed to light in a camera, then fumed with mercury vapour and fixed with common salt in solution.