Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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1. A printing process which involves the transferral of the image from a litho stone or a plate to a rubber-covered cylinder, which is then offset by pressure onto the paper. The image area of the plate is receptive to ink, whereas the balance of the plate is water receptive. 2. The inadvertent transfer of (printing) ink from one printed sheet or illustration to another sheet. Offsetting of this nature may occur during printing, in the printing warehouse storage area, during folding of the sheets, or during binding (pressing) before the ink is completely dry.

Offsetting from illustrative matter onto text matter is probably more common than that from text sheet to text sheet. Also frequently called "rub off" or set off. See also: BARRIER SHEET . 3. The result of undried ink or excess ink accumulating on some part of the printing press after the paper leaves the impression cylinder. This ink is transferred to the paper at the second impression and, if the registration is not absolutely accurate, the offset will give a shaded edge effect to the print. See also: DOUBLING . (17 , 69 , 316 )

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