You need 3 coatable emulsions sensitive to R/G/B light. You need 3 Azo dyes such as Solantine Yellow, Solantine Pink and Chicago Blue. You need a developer such as Dektol, an acid dye bleach which is basically Sulfuric Acid mixed with a catalyst. One such is Phenazine. You need a fix that is a B&W fix.

There you go. Simple as can be. I've hand coated this mix and made some quite nice demonstrations of dye bleach.

But that was at EK. At home here, I did a single color Magenta, and posted the results elsewhere.

PE