Why are blueprints blue?

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Author's Note: Why are blueprints blue?

Do you ever wish you could have been a silent, unseen observer during an interesting moment in history? I wish I could have seen the faces of Johann Konrad Dippel and his lab-mate as they witnessed their concoction turn a deep and unexpected blue. Until this discovery, blue was difficult and costly to make. It required ingredients like lapis lazuli, which at the time cost more than gold.

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  • Granaham, Geraldine. "Blueprints, Then and Now." New York Historical Society Museum and Library. Jan. 24, 2012. (Feb. 23, 2013) http://blog.nyhistory.org/blueprints-then-and-now/
  • Pendle, George. "Colors: Prussian Blue." Cabinet Magazine. Fall 2008. (Feb. 24, 2013) http://cabinetmagazine.org/issues/31/pendle.php
  • Soniak, Matt. "Why Are Blueprints Blue?" Mental Floss. Oct. 17, 2012. (Feb. 24, 2013) http://mentalfloss.com/article/12797/why-are-blueprints-blue
  • University of Texas. "From Blue Skies to Blue Print: Astronomer John Herschel's Invention of the Cyanotype." University of Texas. Dec. 7, 2010. (Feb. 23, 2013) http://www.utexas.edu/opa/blogs/culturalcompass/2010/12/07/from-blue-skies-to-blue-print-astronomer-john-herschel's-invention-of-the-cyanotype/

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