English
interpositive
From inter- + positive.
Today it means
noun A specialized type of negative film stock that is part of the intermediate process that goes from an original negative to a release element (most common in the motion picture film post-production process). The material used is itself the same as in an internegative. The differences is that an IP has a positive image on it, while an IN has a negative image.
Language periods are conventional ranges, not dates for this word.
Etymograph / interpositive