bipack

[bahy-pak]

bi·pack

[bahy-pak]
noun Photography.
two separate films, each having an emulsion layer sensitive to a different color, held together with their emulsion layers facing for simultaneous exposure through the back of one.

Origin:
1920–25; bi-1 + pack1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Bipack is always a great word to know.
So is frame line. Does it mean:
a horizontal line separating consecutive frames on a strip of film
a mechanism that intermittently advances the film through the film gate of a camera or projector
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