Quote Originally Posted by Athiril View Post
PE: Out of curiousity, how would you dye a single layer emulsion that would hold the dye during processing?
I would use an anionic dye and mordant it in place with a divalent or trivalent metal or use a cationic mordant. So, for example, I would dissolve a sulfonate of an azo dye in water + gelatin, then I would precipitate it in-situ with Aluminum or Calcium Sulfate, wash our the excess Sulfate, mix with the emulsion and coat.

This is exactly what I have done to make multi and single color coatings for dye bleach and it is quite simple.