This alkaline step breaks up the adhesive holding the remjet to the back of the film and ultimately removing it during the rinse phase before developing. For DIY users, eliminating the remjet required a mixture of washing soda and baking soda. The C-41 process does not have a step to remove a remjet layer. As a result of the dry Vegas weather, no remjet layer, and advancing the film too quickly in my Pentax 67, I was surprised to see static discharge on my roll of CineStill Film 800T. While this may give a neat artistic look, it is something cinematographers want to avoid. When static discharges on film, it creates a spark that shows up on your film. This rapid movement through the camera can build up static. In the motion picture industry, film pulls through a camera at 24 frames per second (or more). Secondly, the remjet layer displaces static build-up. The first is that it acts as a layer that significantly dampens halation (light passing through the film and bouncing back into the emulsion). The remjet layer is on the back of this film for multiple reasons. This prebath step removes the adhesive holding a layer of black carbon off the backing of the film called the remjet layer. While the processes may be similar, the process includes what is called a prebath. These motion picture stocks use a chemistry process called ECN-2. Kodak Motion Picture film, while it is a color negative film, is not intended to be processed in the C-41 color negative development process.
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