Redscale is the name given to a technique of shooting
photographic filmwhere the film is exposed from the wrong side, i.e the emulsion is exposed through the base of the film. Normally, this is done by winding the film in upside-down into an empty film canister. The name "redscale" 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). All layers are sensitive to blue light, so normally the blue layer is on top, followed by a filter. In this technique, blue light exposes the layers containing red and green dyes, but the layer containing blue dye is left unexposed due to the filter. E-6 (color slide) film has also been used for this technique.
Depending on the type of film used, the resulting colors seem to range from maroon, to red, to orange, to yellow.
The technique seems to have been discovered accidentally. Some people shooting large format color film would load the individual negatives backwards. This phenomenon is likely as old as color film itself. However, it has only recently gained popularity as an effect intentionally sought.
The technique is considered by some to be part of the
lo-fi photographymovement, along with use of toy cameras, pinhole cameras, instant cameras, and sprocket hole photography.
* [http://fmphotocourses.blogspot.com/2007/07/how-to-make-redscale-film.html Instructions on how to make redscale film]
* [http://alspix.blog.co.uk/2006/09/12/title~1120759 Redscale Technique]
* [http://www.flickr.com/groups/redscale/ Flickr 'redscale' group] - examples and discussion
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