Correct me if I'm wrong, but if you had three sheets (R, G, and B, to keep it simple...) you wouldn't necessarily have to re-expose to Red, Green, and Blue light, you could (since the exposure is on three separate sheets) re-expose each sheet to white light, then redevelop the R sheet in the cyan developer, the G sheet in magenta developer, and the B sheet in the yellow developer, right? That would eliminate the complexities of filtration and exposing only one side. Of course then you'd have the registration problem when you went to put it back together. IDK.

ME Super