Positive-negative film
Encyclopedia
Positive-negative film is instant
Instant film
Instant film is a type of photographic film first introduced by Polaroid that is designed to be used in an instant camera...

 photographic film
Photographic film
Photographic film is a sheet of plastic coated with an emulsion containing light-sensitive silver halide salts with variable crystal sizes that determine the sensitivity, contrast and resolution of the film...

 that generates both a positive print and a negative
Negative (photography)
In photography, a negative may refer to three different things, although they are all related.-A negative:Film for 35 mm cameras comes in long narrow strips of chemical-coated plastic or cellulose acetate. As each image is captured by the camera onto the film strip, the film strip advances so that...

 from a single exposure on a single medium.

Polaroid Type 55
Polaroid type 55
Polaroid Type 55 film is a black-and-white peel-apart Polaroid film that yields both a positive print and a negative image . Though box-rated at 50 ISO, the positive and negative parts of the film are effectively rated at 50 and 35 , respectively. It is possible, however, to rate the negative at 32...

, Polaroid Type 665, and Polaroid Type 105 are notable films of this variety.
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