cyanotypes

/saɪˈænəˌtaɪps/
noun
  1. Photographic prints made using a process that produces blue-colored images, often used for blueprints or artistic prints.
    • Engineers once used cyanotypes to create blueprints of their building designs.
    • She learned how to make cyanotypes by exposing paper coated with iron compounds to sunlight.
    • The artist displayed a series of cyanotypes of leaves and flowers at the gallery.
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