<P> Instant film is a type of photographic film introduced by Polaroid to be used in an instant camera (and, with accessory hardware, many other professional film cameras). The film contains the chemicals needed for developing and fixing the photograph, and the instant camera exposes and initiates the developing process after a photo has been taken . </P> <P> In earlier Polaroid instant cameras the film is pulled through rollers which breaks open a pod containing a reagent that is spread between the exposed negative and receiving positive sheet . This film sandwich develops for some time after which the positive sheet is peeled away from the negative to reveal the developed photo . In 1972, Polaroid introduced integral film, which incorporated timing and receiving layers to automatically develop and fix the photo without any intervention from the photographer . </P>

What type of film do polaroid cameras use