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Offset
Alternate term often used for Setoff.

Offset paper
Alternate term often used for Uncoated book paper

Offset powder
Fine powder sprayed on freshly printed sheets to prevent transfer of wet ink as they accumulate in the delivery stack.

Offset printing
Method of lithographic printing that transfers ink from a plate to a blanket, then from the blanket to paper.

OK sheet
Printed sheet representing final inking adjustments approved before production run begins.

Opacity
Characteristic of paper that helps prevent printing on one side from showing on the other.

Opaque
Not transparent. Also, a verb meaning to cover flaws in negatives with paint or tape. Also, the paint used for this purpose.

Opaque ink
Heavily pigmented ink that blocks out color of underlying ink or paper.

Open web
Web press without a drying oven. thus unable to print on coated paper.

Outline halftone
Halftone in which background has been removed to isolate or silhouette an image.

Overlay
Sheet of tissue or acetate taped to a mechanical so that it covers the mounting board.

Overlay proof
Color proof consisting of acetate sheets covering each other in register, one for each color to be printed.

Overprint
To print over a previously printed image.

Overrun
The number of pieces that were printed in excess of the quantity specified.

Overs
Printed pieces in an overrun.