Cyanotype
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The cyanotype is a slow-reacting, photographic printing formulation sensitive to a limited near-ultraviolet and blue light spectrum, the range of 300 nm to 400 nm, known as UVA radiation. It produces
A cyanotype of algae by 19th century botanist Anna Atkins
Sir John Herschel (1842) Experimental cyanotype of an unidentified engraving of a lady with a harp, Museum of the History of Science
Architectural drawing blueprint, Canada, 1936
Cyanotype postcard, Racine, Wis., c. 1910
Anna Atkins
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Anna Atkins was an English botanist and photographer. She is often considered the first person to publish a book illustrated with photographic images. Some sources say that she was the first woman to
Cyanotype
…Intensifying and fixing is achieved simply by rinsing the print in water in which unexposed sensitizer and reaction products are readily soluble. Anna Atkins, a friend of the Herschel family, over 1843–61 and with the assistance of Anne Dixon, hand-printed several albums of botanical and textile specimens…
Atkins in 1861
Detail of title page of Photographs of British Algae: Cyanotype Impressions
Cyanotype photogram of Wood Horsetail from the 1853 book Cyanotypes of British and Foreign Ferns by Atkins and Dixon