Counterproof
Encyclopedia
In engraving
Engraving
Engraving is the practice of incising a design on to a hard, usually flat surface, by cutting grooves into it. The result may be a decorated object in itself, as when silver, gold, steel, or glass are engraved, or may provide an intaglio printing plate, of copper or another metal, for printing...

, a counterproof is a print taken off from another just printed, which, by being passed through the press
Printing press
A printing press is a device for applying pressure to an inked surface resting upon a print medium , thereby transferring the ink...

, gives a copy in reverse, and of course in the same position as that of the plate from which the first was printed, the object being to enable the engraver to inspect the state of the plate.

Counterproofing was used to produce the finest quality copperplate printing; the second print consisted of delicate lines, and lacked the beveled impressions seen in the original print.

To counter-prove is also to pass a design in black lead or red chalk through the press, after having moistened with a sponge both that and the paper on which the counterproof is to be taken.
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