Technique
Bleach bypass can be done to any photochemical step in the process, be it original camera negative, interpositive, internegative, or release print. For motion pictures, it is usually applied at the internegative stage, as insurance companies usually are reluctant to have the original negative bleach bypassed in the event that the look is agreed to be too extreme, and the cost of the process for each individual release print is usually cost-prohibitive. The effect, however, will render slightly differently at each stage, especially between the negative and positive stages.
Bleach bypass generally refers to a complete circumvention of the bleach stage of development, and is the most commonly offered service among labs. Technicolor's ENR and OZ and Deluxe Labs' ACE and CCE processes are proprietary variants which allow the film to be only partially bleached, giving the cinematographer a more finely tuned control over the effect rendered by the process.
While originally a laboratory technique, a similar effect can now be achieved digitally through digital intermediate color grading.
Read more about this topic: Bleach Bypass
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