bipack

[ bahy-pak ]
/ ˈbaɪˌpæk /

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.

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Origin of bipack

First recorded in 1920–25; bi-1 + pack1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020