Noun
internegative (plural internegatives) (abbr. IN or I.N.)
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 interpositive. The differences is that an IN has a negative image on it, while an IP has a positive image.
This meant that the entire printing negative had to be disassembled, and the CRI (color reversal internegative) portions cleaned separately from the negative portions. Source: Internet
It was discovered that in addition to the negative motion picture stocks commonly used on feature films, Lucas had also used internegative film, a reversal stock which deteriorated faster than negative stocks did. Source: Internet