Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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The unintentional printing of a repeat image from a single form that is out of register. Doubling is particularly troublesome in halftone work because it adversely affects both tone and color values. It may be caused by several things, including rippling of the paper or premature contact with the form or offset blanket. It may also occur if sheets slip in the gripper or if the paper stretches during printing. Play in the press cylinders resulting in printback of ink picked up from the paper by the blanket can also cause doubling, as can the succeeding printing unit being slightly out of register with the original print. (17 )

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