![]() ![]() ![]() The mix is derived from an aqueous solution and is left out to dry. This is then placed on paper that has been coated with ammonium iron citrate and potassium ferrocyanide: the blueprinting paper. It starts out with creating a drawing on translucent tracing paper. The process of making blueprints is what gives it the distinct color. This process was widely used for over a century, and though not as common anymore, the word ‘blueprint’ is still popular among architects, engineers, drafters and construction workers to refer to floor plans. Blueprints were introduced by Sir John Herschel in 1842 and were a means of quickly and accurately producing unlimited copies of drawings. Blueprints are used for the reproduction of architectural or engineering drawings by a contact print process on sheets that are light-sensitive.
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