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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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