Cyanotype is the photographic printing process discovered by Sir John Herschel, a scientist, in 1842 as a means to reproduce diagrams. It creates a cyan blue silhouette when an object is placed on a reactive surface and develops in UV light – a blueprint. Herschel inspired his friend, Anna Atkins, a botanist, who made cyanotype images of the flora she collected, earning her place as a founding mother of photography.  source: https://www.telegraph.co.uk/photography/what-to-see/cyanotype-step-blue-see-world-new-light/

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