Been learn a process called Kallitype, an alternative develop out process a bit like Pt/Pd but cheaper.
Slowly getting somewhere, negative need to have a lot more range then a silver gelatin negative. This negative (Fomapan 100 8x10) was developed in Pyrocat HD 2:2:100 (normally 1:1:100) for 18 min, a bit long. Other at 15 min are better. Printed on to Magnani Platinum Reves art paper