An early photographic printing process that produces blue images on paper, invented in the 1840s.
From cyano- (blue) + -type (print or reproduction). The process uses iron compounds that turn bright Prussian blue when exposed to light and developed.
Cyanotypes were the Instagram filters of the 1800s—photographers loved them because they were cheap, cheerful, and the results were stunning blueprints of ferns and buildings that could last for centuries without fading, and they're still used by artists today.
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