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By gum ...
Gum bichromate is a 19th century photographic printing process based on the light sensitivity of dichromates. It is capable of rendering painterly images from photographic negatives.
Not still in a dark room which stinks of hypo ?.A digital darkroom (computer) can do anything that can be done in a wet darkroom, only quicker and easier ... [ Invalid Attachment ] The above bias-relief took 30 seconds on a computer rather than 30 minutes, or more, it would have taken in a wet darkroom.
If you keep a palladium print dry it is as stable as the Lascaux paintings.
Sadly, because of deterioration from the body heat and breath of visitors, the cave had to be closed in 1963; now you have to be content with the replica known as Lascaux II