Cyanotype Print, Fern

Cyanotype Print, Fern

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Credit: Ted Kinsman/SCIENCE PHOTO LIBRARY

Caption: A cyanotype print with the fern that cast the shadow seen in the print. In this process an object is placed on the ultraviolet sensitive chemically treated paper and exposed to a strong UV light source in this case sunlight. The object is then removed and the print washed in cool water to remove the unreacted chemicals. Cyanotype is a photographic printing process that produces a cyan-blue print. Engineers used the process well into the 20th century as a simple and low-cost process to produce copies of drawings, referred to as blueprints. The process uses two chemicals: ammonium iron(III) citrate and potassium ferricyanide. The English scientist and astronomer Sir John Herschel discovered the procedure in 1842.

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Keywords: calotype, cyanotype, fern, ferricyanide, first science photo use, herschel, history of photography, history of science, indicator, john herschel, photograph, photographic, photography, scientific photography, sensitive, sequence, sir john herschel, ultraviolet, uv, uv indicator, uv sensitive

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