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• Photography
  ...d by [[Mercury (element)|mercury]] vapor, and "fixed" with hot saturated [[sodium chloride|salt]] water—were in place in 1837. The required exposure time w ...raphy", "negative" and "positive". He had discovered in 1819 that [[sodium thiosulphate]] was a solvent of silver halides, and in 1839 he informed Talbot (and, ind
  82 KB (11,317 words) - 14:56, 13 August 2022