Technically, Ciba wasn't a reversal process at all, but a direct positive process. Very high quality azo dyes are still available - no need for food coloring. As you already proably know, I'm one of the folks
who acquired commercial dyes for dye transfer work which are nearly indistinguishable from Kodak brand dyes. I have full sets of both. But what I'm really interested in are further developments in
nano-pigments, which would revolutionize this entire subject.