blueprintn.A print made using the Prussian blue (ferroprussiate) process; a cyanotype.A reproduction of an architectural drawing, especially one made using the blueprint process.
NotesIn general, 'blueprint' is used for architectural drawings, while cyanotype is used to describe continuous-tone photographic prints, even though the process is the same. It is not uncommon for 'blueprint' to be used generically to refer to any architectural drawings, regardless of process.
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