When I compared PMK and Pyrocat-HD in the past, I wrote: "Pyrocat negatives print much like PMK negatives on VC papers, but require less exposure on graded papers than similar PMK negatives, because the brown stain doesn’t inhibit the blue light that paper is sensitive to as much as a yellow stain would. Sandy King has stated that alternative process printers who print with UV light sources find their exposure times reduced with Pyrocat-HD when compared with print times from pyro negatives."(posted 8073 days ago)I've never used Rollo Pyro, so I don't know it's characteristics. I have found that if I print PMK or Pyrocat-HD negatives on VC paper I need number 3 or 4 filtration to boost contrast in the high values, which in turn increases exposure times. But I've gotten exquisite results with Bergger CB Warm grade 2, Ilford Galerie grades 2 and 3.