Cyanotype is a photographic process that creates a cyano-blue print after development.
The English scientist, photographer and astronomer John Herschel discovered this process in 1842. Although John Herschel might be the discoverer of the cyanotype process, Anna Atkins is the one who applied it in photography. She published a limited series of books with cyanotype images that described ferns and other plants. Because she used this process, she is also considered to be the first female photographer.
The process uses two chemicals:
    Ammonium iron citrate
    Potassium hexacyanoferrate (III).
The result was that when these two substances were exposed to strong light they changed to Prussian blue. When the chemicals were washed away with water, a stable and characteristic blue color remained, on which the image was shown in white lines.
                                
 
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