Copy of a film on extremely fine grained stock used to make an internegative.
This is a very fine grain film stock that is used to make a duplicate negative.It is also used in special effects, title super-impositions fades, dissolves, etc.It is never projected and is only an intermediate step for making something else.It can be used for video transfers.
A positive film stock, used for optical negatives, sometimes called an "I.P." Technically, a color fine-grain positive print used for making color dupe negatives.
From a traditional photographic perspective, an Interpositive is essentially a negative processed in a positive process. An original negative is exposed to film in-where the film is processed creating a like image, 'a negative', in a positive process, an Interpositive.