Bipack | Article about bipack by The Free Dictionary
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A photographic film composed of two sensitive emulsions; each is sensitive to a different color when exposed simultaneously.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Panchromatic negative film is used in the camera as the rear component of a bipack
in which the front film is a positive yellow dye image of the background scene.
It comes in standard 50-g kits and can be specially packaged in divided bipacks
or pre-mixed and frozen syringes upon request.