Quote Originally Posted by Petzi
It seems unlikely to me that exposure from a particular side of the film is required, other than that the film is opaque at this point in the processing, and that this means the light might not get to the right layer if applied from he wrong side. I would assume that the side is irrelevant if enough light gets to the emulsion. Perhaps Photo Engineer can shed some light on this issue.
This is where you are wrong. Each of the three emulsions layers must be developed separately and must be exposed to light from a specific side. I believe the center layer is the last to be developed and may use a fogging developer. It has been years since I read about the K12 and K14 processes. The Dignan Newsletter published the formulas as in intellectual curiousity. The steps in the process are far more exacting and complex than the E-6 process.