Fascinating Umut

thank you very much for such a wonderful response.

I am very serious about the four colour process as I am making four colour separation negatives via inkjet and as well silver negatives from my Lambda76 (big image setter)

To date we have pretty much tried every process that I want to work with. for colour we have been doing tri colour gum over pt pd with amazing success and as well I have had great progress with intaglio raised polymer plates, ( we can make these in house so there is total control)

What I would like to ask you is specifically where would I find the inks that exhibit the century old light fastness results, and of course who makes them, or do they have to be custom made.??