The result is a blue negative conversion where the black lines become white, and the background white colour becomes blue. Industrial plotters can churn out millions of square feet of plotter paper per year. Paper-to-paper document duplications is a common service we take for granted these days. The term "blueprint" is usually used to describe two printing methods, the blueprint and the diazotype.
Blueprinting is the older method, invented in The drawing to be copied, drawn on translucent paper, is placed against paper sensitized with a mixture of ferric ammonium citrate and potassium ferricyanide. The sensitized paper is then exposed to light. Where the areas of the sensitized paper are not obscured by the drawing, the light makes the two chemicals react to form blue.
The exposed paper is then washed in water. This produces a negative image, with the drawing appearing in white against a dark blue background. Viewing and sharing plans digitally is here to stay.
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On Center Support. General Support. About On Center Software. Sales: Existing Customers: Author: oncenter Posted: October 26, Technical drawings of architectural or engineering designs always seem to consist of white images and text on blue paper.
The blueprinting process was developed in the mids, when scientists discovered that ammonium iron citrate and potassium ferrocyanide created a photosensitive solution that could be used for reproducing documents.
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