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cyanotype

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Broader Term: 

n. ~ 1. A photographic process that uses Prussian blue for the image to produce a positive print from a negative. - 2. A print made by the process.

Notes: 

Cyanotype is identical to the blueprint process, but the former is typically used to describe continuous-tone photographic prints, while the latter is used to describe reproductions of line drawings. The Pellet or blueline process produces a positive image from a positive image. Typically on paper but sometimes on cloth or another support. The process was invented by Sir John Herschel in 1840 and remains in use today.