Specialty positive film stock for creating duplicates from original negatives — preserves source material while enabling multiple prints and versions.
When working with an original negative in 35mm or 16mm, you ideally want to touch it as little as possible. That's the core idea: an interpositive is an intermediate step—a positive film that you print from the original negative, from which you then create new negatives or positives without touching the original. In the classic film production workflow, this was indispensable for international versions, archiving, or duplicates.
The practical reason lies in the material itself. Every time you copy a film—exposure in an optical printer, transport through the machine—you risk scratches, dust, and wear. With the interpositive, you create a protective layer: the negative stays in its can, and you work with the interpositive. For an international copy, for example, you'll need different language versions of the titles or local censorship cuts. Instead of cutting or re-exposing the original, you print from the interpositive and create a new duplicating negative (also called a CRI, Colour Reversal Intermediate), from which the cinema versions are produced.
Technically, it works like this: your original negative (sub-standard or large format) is exposed onto a special positive film in an optical printer. This film—the interpositive—receives color corrections and is exposed so that it is already in color and with correct tonality. You can then view it, archive it, and, if necessary, pull new second or third-generation negatives from it. Professional labs also use interpositives for color encoding standard adjustment—you can correct one version for the American market, another for European cinemas, without touching the original.
In the digital age, the interpositive has become less relevant, but in archives, during restorations, or when 35mm film prints are still maintained, it remains standard. Anyone working with analog materials or preserving historical films cannot avoid understanding this: the interpositive is your insurance against wear and tear—a silent but crucial layer between the original film and the audience.