Blueprint
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A blueprint is a reproduction of a technical drawing or engineering drawing using a contact print process on light-sensitive sheets introduced by Sir John Herschel in 1842. The traditional white-on-bl
Blueprint for a Butler-class destroyer escort, 1944
A member of the Women's Royal Naval Service operates a blueprinting machine during World War I
Architectural drawing, Germany, 1902
Architectural drawing, Canada, 1936
Prussian blue
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Prussian blue is a dark blue pigment produced by oxidation of ferrous ferrocyanide salts. It has the chemical formula Fe43. It consists of Fe3+ cations, where iron is in the oxidation state of +3, and
Blueprint
…ferric iron into divalent ferrous iron. The image is then developed using a solution of potassium ferricyanide forming insoluble ferroferricyanide (Prussian blue or Turnbull's blue) with the divalent iron. Excess ammonium ferric citrate and potassium ferricyanide are then washed away. The process is also known as cyanotype. This…
Sample of prussian blue
The Great Wave off Kanagawa by Hokusai, an artwork that makes extensive use of Prussian blue
Prussian blue in a vial
Simulated powder x-ray diffraction profile for Prussian blue crystal, crystallographic direction annotated. Image generated using CrystalMaker software.