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leonardo's red paper

leonardo's red paper

An experimental cyanotype of an engraving of a lady with a harp, by Sir John Herschel (1792-1871), 1842. Herschel invented the cyanotype or ‘blueprint’ in 1842, employing iron  salts (ferric ammonium citrate and potassium ferricyanide) which produce  Prussian blue under the action of light. It was a simple process to use  and required only water as a fixative. The cyanotype was the only first-generation photographic technique to find any lasting use.

An experimental cyanotype of an engraving of a lady with a harp, by Sir John Herschel (1792-1871), 1842. Herschel invented the cyanotype or ‘blueprint’ in 1842, employing iron salts (ferric ammonium citrate and potassium ferricyanide) which produce Prussian blue under the action of light. It was a simple process to use and required only water as a fixative. The cyanotype was the only first-generation photographic technique to find any lasting use.

Alchemilla Mollis cyanotype

Alchemilla Mollis cyanotype

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