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Instant film is a photographic film that is designed to be used in an instant camera (and, with accessory hardware, with many professional film cameras). The film pack contains the chemicals needed for developing, and the instant camera automatically initiates the developing process after a photograph has been taken. In most types of Polaroid instant cameras, the film is pulled out through rollers which break open a pod containing the chemicals. The chemicals spread out over the surface of the film, and the positive image appears a few seconds to minutes later. The chemicals have time delays built into them so that each layer of the film can be processed in the correct order. Instant film is available in sizes from 24 mm x 36 mm (similar to 135 film) up to 8" x 10" size, with the most popular film sizes for consumer snapshots being approximately 3¼" x 4¼" (the image itself is smaller as there is a border surrounding the image). Early instant film was distributed on rolls, but currently is typically distributed folded into film packs of 8-10 exposures that allow each image to be removed from the camera after it has exposed. Some modern film packs also contain a flat electrical battery to drive motors in the camera. This inclusion of the battery with the film ensures that a properly charged battery is always available for use. Single sheet films are also available for use in large format cameras.