Why Are Blueprints Blue? | Mental Floss: It’s because of how those documents are made. The blueprinting process was developed in the mid-1800s, when scientists discovered that ammonium iron citrate and potassium ferrocyanide created a photosensitive solution that could be used for reproducing documents.
Wednesday, October 17, 2018
Why Are Blueprints Blue? | Mental Floss
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