Rollei Redbird 35mm x 36 redscale film

Redbird is the name given to a technique of shooting photographic film where the film is exposed from the wrong side, i.e the emulsion is exposed through the base of the film. The name "redscale/redbird" comes because there is a strong color shift to red due to the red-sensitive layer of the film being exposed first, rather than last (the red layer is normally the bottom layer in C-41 (color print film)).