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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.


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.


(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.


a photographic print of plans, technical drawings, etc., consisting of white lines on a blue background
References in periodicals archive ?
The old system of operation by singleowned stage carriage permit holders/ Blueline bus operators is no more feasible, advisable or permissible.
Those onboard often jump out of moving buses as the drivers, like their Blueline counterparts, only slow down and do not stop ( When they were introduced, the buses used to stop only at designated stands) Drivers allow the electronic doors to open anywhere on the road to let passengers board or alight.
Singh, appearing for the Blueline operators, however, contended that the figure was misleading and that the Capital would face hardship if the buses were taken off the roads.
These blueline buses could run under a new system ( categories) until their 10- year shelf life is over.
Even in its last leg, the Blueline spilled blood on the roads.
The government makes statements pertaining to taking Blueline buses off the roads only under court pressure or as a face- saving exercise.
THE DELHI government is repoertedly planning to bring back the killer Blueline buses, probably in a new avatar, despite the public outrage over these vehicles.
Thus began the era of the Redline bus, the earlier prototype of Bluelines
THE Delhi government is likely to decide the fate of the infamous Blueline buses on Monday evening.
Around 1,600 Bluelines buses were taken off the Delhi roads during the Commonwealth Games.
The Bluelines were taken off certain stretches of Delhi ahead of the October 3- 14 Commonwealth Games.
Government officials claimed there were enough Delhi Transport Corporation ( DTC) buses to deal with the shortage of Bluelines.