Friday , 24 November 2017
Sir John Herschel

Sir John Herschel

John Herschel is father of the cyanotype. But he also made improvements to other photographic processes. Long before cyanotype, Herschel discovered sodium thiosulfate to be a solvent of silver halides in 1819. He then informed William Henry Fox Talbot and Louis Daguerre – inventor of the daguerreotype – that this “hyposulphite of soda” could be used as a fixer to make light-sensitive images permanent. Sir Herschel presented his groundbreaking research to the Royal Society on March 1839 and January 1840.

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