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Catalogue Entry 1989

[] Potassium ferrocyanide fixing experiments by Sir John Herschel, 1839. Paper treated with weak 'ferrocyanate of potash', and photogenic drawing unsuccessfully fixed with this instead of hypo (blue and yellow). These effects foreshadowed the cyanotype. Herschel's inscription on February 15, 1839, is one of the earliest instances of his word 'Photogr[aph]'.

[From the exhibition booklet Photography 150: Images from the First Generation (Oxford: Museum of the History of Science, 1989)]

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