Polaroid cameras have a built-in instant processing facility which produces prints in a matter of seconds. The film contains layers of negative and positive chemicals (salts) and a packet of jelly-like developing chemicals. After exposure, the film passes through a pair of steel rollers. The pressure of the rollers burst the packet and the released developing chemicals immediately convert the exposed area of the negative layer. The salt at the unexposed area then reacts with the positive layer and forms a positive image.
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| A Polaroid Camera |
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