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white-on-blue photographic print, commonly of a working drawing used during building or manufacturing. The plan is first drawn to scale on a special paper or tracing cloth through which light can penetrate. The drawing is then placed over blueprint paper, prepared with a mixture of potassium ferricyanide and ammonium ferric citrate. When the attached drawing and the blueprint paper are exposed to a strong light, the unprotected ferric salt not lying beneath the lines of the drawing is changed to a ferrous salt that reacts with the ferricyanide to form Turnbull's blue. This blue is the background of the finished print. The ferric salt under the lines of the drawing, protected from the light, remains and is dissolved during the washing in water that follows exposure. As a result, the lines of the original drawing appear white in the finished blueprint.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.


A reproduction of a drawing by a contact printing process on light-sensitive paper, producing a negative image of white lines on a blue background; refers to architectural working drawings for construction.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved


(graphic arts)
A contact print, with white lines on a blue background, of a drawing; made on linen or on ferroprussiate paper and developed in water or a special solution.
A photoprint used in offset lithography or photoengraving for use in checking positions of image elements.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


a photographic print of plans, technical drawings, etc., consisting of white lines on a blue background
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
References in periodicals archive ?
Wilson's legal woes stretch back to 2013, when he posted blueprints for the 3D gun.
Not realising aspects of your blueprint isn't a sign of failure; it occurs more as a result of responding and adjusting to the multitude of choices and decisions we constantly face.
Thanks to Dave Manson and Manson Precision Reamers (, 810/953-0732), the need for extensive training in order to blueprint actions has been greatly lessened.
"This specific blueprint is truly exceptional and the only authorised copy," he added.
But they and the plans ended up at the bottom of the Atlantic, leaving this the only remaining blueprint of the Titanic.
Last December, German authorities seized the blueprints from the Hamburg home of the Sudanese man, who is allegedly linked to the al-Qaida terrorist network.
On its own, the robot then designed thousands of blueprints for "baby robots" and crunched complex math problems to predict how far and how fast each robot would move in the real world.
Yet blueprints for such homes are as scarce as old-growth cedar.
A discussion with a visiting architect would help students understand the importance of architecture, and an introduction to blueprints would introduce them to a different kind of linear drawing.
In a biochemical tour de force, three Denver researchers designed and drew up blueprints for a hypothetical protein they predicted would act somewhat like the pancreatic digestive enzyme chymotrypsin.