Cyanotype Print of Kelp Seaweed

Cyanotype Print of Kelp Seaweed

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Credit: Ted Kinsman/SCIENCE PHOTO LIBRARY

Caption: This is a cyanotype print of Kelp (Macrocystis sp.) collected in the waters of California along the Pacific Ocean. 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: brown algae, calotype, cyanotype, ferricyanide, first science photo use, herschel, history of photography, history of science, indicator, john herschel, kelp, macrocystis, photograph, photographic, photography, scientific photography, sea weed, seaweed, sensitive, sir john herschel, ultraviolet, uv, uv indicator, uv sensitive

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