Cyanotype Print of Sea Colander Seaweed
This is a cyanotype print of Sea Colander (Agarum sp.) collected in the Atlantic waters of Canada. 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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