Bob,
Humidity of the paper as it is stored and at the time of coating, as
well as of the coated sheet at printing, are huge factors in Pt/Pd
printing either develop-out or print-out. Also, it depends on the paper:
some want drier and some want moister. I'm running a whole set of tests
of this right now because the winter heating season has drastically
changed my darkroom's humidity. I'll post some notes as the answers are
found. For a start, humidity around 50% will be much better than lower,
and as high as 70% can be desirable for some papers, notatbly Platine.
---Carl
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