blueprint

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Blueprint

1. A construction plan. It is called a blueprint because it historically has been printed on blue paper with white lines.

2. In photography, a copy of a periodical printed before final editing in which images are shown on blue paper.

3. Informal, a plan.

blueprint

A detailed set of plans used as a guide for construction.Because of the economies of a very inexpensive method of creating and copying such plans, they were formerly characterized by white lines on blue paper.

References in classic literature ?
Large blue silk flags were flying from the windows of the Town Arms Inn, and bills were posted in every sash, intimating, in gigantic letters, that the Honourable Samuel Slumkey's committee sat there daily.
At one end stood a great fireplace, in which a blue log was blazing with a blue flame, and over the fire hung four kettles in a row, all bubbling and steaming at a great rate.
An old, pointed blue hat, that had belonged to some Munchkin, was perched on his head, and the rest of the figure was a blue suit of clothes, worn and faded, which had also been stuffed with straw.
All night in the Blue Light Drug Store he waited at his duties for chance news of the tragedy, but none came.
I escaped from the Blue Place of Seven Skulls," Bradley reminded her.
The warriors turned to their leader, as if to read his opinion of this unlucky omen; but the countenance of Blue John remained unchanged, and they continued to press forward.
Now news had been brought to Robin Hood how that Little John, instead of doing his bidding, had passed by duty for pleasure, and so had stopped overnight with merry company at the Blue Boar Inn, instead of going straight to Ancaster.
They looked like a flock of blue-birds, all being in sailor rig, with blue ribbon enough flying from the seven hats to have set up a milliner.
The high, deep, blue sky arched over Misselthwaite as well as over the moor, and she kept lifting her face and looking up into it, trying to imagine what it would be like to lie down on one of the little snow-white clouds and float about.
And Cecily is a sweet pink, like those mayflowers, and Sara Ray is very pale blue, and Dan is red and Felix is yellow, like Peter, and Bev is striped.
That, too, vanished, and Saxon and Billy looked at each other, she with amazement at the swimmer's valor, Billy with blue eyes flashing.
Most of his poems, other than certain political satire, which drew on him the Emperor's wrath, are full of subtle sadness and fragrant regret, reminding one of pot-pourri in some deep blue porcelain bowl.