doubling
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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