I regularly print from interpostives in the gumoil process on
paper--ordinary paper, as it comes out of my computer-linked printer. I
have done numerous tests comparing paper, to acetate,to vellum, to darkroom
film enlargements, but they all work fine with some adjustments to exposure
times. I wouldn't do platinum from paper probably, but most of the alt
processes work fine with paper internegs or interpossies. Relax and enjoy.
Karl Koenig