Redscale...
Exciting news today from Lomography with their announcement of the first preloaded, ready to shoot Redscale film.
Redscale was a technique was probably accidentally discovered when someone wound the film into canister the wrong way so the frames were exposed from the wrong side, i.e the emulsion is exposed through the base of the film.
There’s some examples of this in the Flickr group Redscale Film.

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