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OFFSET/OFFSETTING
Partially transferring ink from a freshly printed surface to an
adjacent surface, such as another sheet of paper.
OFFSET LITHOGRAPHY PRINTING
Any printing process where the image on the plate is first offset
onto a blanket that transfers the ink image to the paper. (See Lithography
for wet offset or Dry Offset for dry.)
OFFSET PAPER
Any paper primarily suited for offset printing; also known as book
paper. Can be coated or uncoated with a vellum or smooth finish.
Characterized by strength, dimensional stability, lack of curl and
freedom from foreign surface material.
OPACITY
Measures the degree to which paper stops light from passing through.
The more opacity a paper has, the less show-through it permits of
an envelope's contents. Inside tints can be used to compensate
for low-opacity papers. Envelope blanks are frequently printed on
the inside of a finished envelope to improve the opacity.
OPAQUE
1) The interior security wash or grey wall printed in an envelope.
2) Permitting no light to show through.
OPAQUE INK
A non-transparent ink that reflects only its color, regardless of
what color overprints.
OPEN END ENVELOPE
Also called a pocket envelope, an open end envelope has its opening
flap on one of the short sides, and usually has a center seam on
the back or a side seam. Catalog envelopes have an open end.
OPEN SIDE ENVELOPE
Has its opening flap on one of the long sides, and has either a
diagonal or double side seam. All commercials are open side; however,
catalog and coins can also be open side.
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