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Four leaves by Herschel, 1839.

Water fixed photogenic drawing negative of four leaves. Sir John Herschel (1792-1871), English astronomer, mathematician and chemist and the son of Sir William Herschel. Herschel introduced 'hypo' (thiosulphate) as a photographic fixerative and discovered the cyanotype or blueprint process in 1842.

Image No. 10305196 | This is a Rights Managed image.

Inventory No.: 1943-0038_0002
Source No.: 1943-0038

Credit © National Museum of Science & Media / Science & Society Picture Library -- All rights reserved.
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