Cyanotypes are the longest lasting photography and was invented in 1840 by Sir John Herschel. In order to make a cyanotype, you place objects on light sensitive paper and let the sunlight expose them. This was an easy and an amateur way of creating photographs. Engineers and architects used this method to create blue prints and drawings. Anna Atkins used this technique to record scientific data on botanical specimens in the the mid 1800's.
AlternativePhotography Posted in History of alt. proc. “Cyanotype history – John Herschel’s invention.” AlternativePhotography.com, 9 Apr. 2017, www.alternativephotography.com/cyanotype-history-john-herschels-invention/. Accessed 13 Sept. 2017.
Falconer, John. “Historic Photographs.” Photographic Processes, The British Library, 7 Mar. 2007, www.bl.uk/onlinegallery/features/photographicproject/photographicprocesses.html. Accessed 13 Sept. 2017.
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