Niepces Process

Niepce's Process was one of the earliest of photographic processes, being first invented in 1813. By exposing a copper or other metal plate covered with asphalt or bitumen to light in the camera, the portions where the light acted were rendered insoluble; and when the rest of the compound was dissolved away by a suitable solvent, these parts stood out in relief. The plate was then used for printing from or etched by acid and employed thus for reproduction.