Positive-negative film is
instant
In physics and the philosophy of science, instant refers to an infinitesimal interval in time, whose passage is instantaneous. In ordinary speech, an instant has been defined as "a point or very short space of time," a notion deriving from its ety ...
photographic
film
A film also called a movie, motion picture, moving picture, picture, photoplay or (slang) flick is a work of visual art that simulates experiences and otherwise communicates ideas, stories, perceptions, feelings, beauty, or atmosphere ...
that generates both a positive print and a
negative from a single exposure on a single medium.
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 that can be used to create enlargements.
The film speed is given by the manufacturers as 50 ISO, however that applies onl ...
, Polaroid Type 665, and Polaroid Type 105 are notable films of this variety.
References
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Photographic film types