Calotype paper process
William Henry Fox Talbot invented the calotype, the first practical negative-positive photographic process. It was patented by him in 1841.
Demonstration by Michael Gray (no sound track)
The concept of negative-positive photography, allowing the production of an unlimited number of prints from a single negative, has formed the basis of photographic practice up until the last few years, when digital imagery has taken over
- A sheet of paper is treated with light-sensitive silver compounds before exposure in the camera.
- The image is then developed in gallo-nitrate of silver and fixed.
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Streaming video in Windows Media format. approx. 3 min
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