Which distinctive color characterizes the cyanotype photographic process, popularized by botanist Anna Atkins?
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Cyanotypes are famous for their deep Prussian blue color, produced when iron compounds react to ultraviolet light. In the 1840s, Anna Atkins used this simple, camera-less process to create the first-ever photographically illustrated book, capturing detailed silhouettes of British algae. Today, the same chemical reaction is why architectural plans are traditionally called blueprints! Photo: Atkins, Anna, 1799-1871, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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