Instant film is also used by artists to achieve effects that are impossible to accomplish with traditional photography, by manipulating the emulsion during the developing process, or separating the image emulsion from the film base.
Some photographers use instant film for test shots, to see how a subject or setup looks before using conventional film for the final exposure. Instant film was used where it was undesirable to have to wait for a roll of conventional film to be finished and processed, e.g., documenting evidence in law enforcement, in health care and scientific applications, and producing photographs for passports and other identity documents, or simply for snapshots to be seen immediately. Though the quality of integral instant film is not as high as conventional film, peel apart black and white film (and to a lesser extent color film) approached the quality of traditional film types. Early instant film was distributed on rolls, but later and current films are supplied in packs of 8 or 10 sheets, and single sheet films for use in large format cameras with a compatible back. Instant film has been available in sizes from 24 mm × 36 mm (0.94 in × 1.42 in) (similar to 135 film) up to 50.8 cm × 61 cm (20 in × 24 in) size, with the most popular film sizes for consumer snapshots being approximately 83 mm × 108 mm (3.3 in × 4.3 in) (the image itself is smaller as it is surrounded by a border). 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. This film sandwich develops for some time after which the positive sheet is peeled away from the negative to reveal the developed photo. In earlier Polaroid instant cameras the film is pulled through rollers, breaking open a pod containing a reagent that is spread between the exposed negative and receiving positive sheet. The film contains the chemicals needed for developing and fixing the photograph, and the camera exposes and initiates the developing process after a photo has been taken. Instant film is a type of photographic film that was introduced by Polaroid Corporation to produce a visible image within minutes or seconds of the photograph's exposure. Lower right: An undeveloped photo, with chemicals still in the pouch at the bottom. Lower left: A photo as the opacifiers clear - the photo is already fully developed beneath. Upper right: Completely exposed developed photo. Upper left: Completely unexposed developed photo. Photographic film which develops in minutes Photographs made using Instax film.
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