Just Google it. The Dye Tranfer Forum is run by Jim Browning, who has a lot to do with the
successful revival of the key materials. He also holds patents on the Chromira. Kodak dyes
weren't unique - they were just high purity versions of common dyes. Tanning developer
is easily made, but I personally prefer a technique more similar to old wash-off relief. What
I have done is modernize separation negative technique, but all darkroom. I get enough of
damn computers here in the office!