Well this is inevitably part of the ongoing debate, Ron. The Germans claim their dye sets test out better than the Kodak dyes. But the primary
dyes in the Kodak sets are easily identified by the CAS #'s and are still in manufacture by reputable sources. Of course, back when DT printing was popular people used all kinds of things as long as they'd mordant, and Kodak was not the only major player. It's kinda academic to me. I'm not a dye chemist and will listen to the debate from the sidelines. Meanwhile, I've got enough actual Kodak branded dye and buffer sets on hand to last me the duration of my own tinkering.