tom's right about pinholes, of course (the reason I was curious in the first place...). This really stumps me. Could it be bad chemicals? I got a bad batch of PMK once, but the problems I had with it were completely different (barely any development at all). Do you place the sheets on something in the tray? If so, maybe it has some chemistry which is reacting with the pyro, which as I'm sure you know is very sensitive to contaminants. If you figure this out, please let us know what it was...and good luck. shawn(posted 9039 days ago)