From Wikipedia: Cyanotype is an old monochrome photographic printing process which gives a cyan-blue print.
The English scientist and astronomer Sir John Herschel discovered this procedure in 1842. Though Sir John Herschel is perhaps the inventor of the cyanotype process, it was Anna Atkins, a British scientist, who brought the process into the realm of photography. She created a limited series of cyanotype books that documented ferns and other plant life. By using this process, Anna Atkins is regarded as the first woman photographer.
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