I agree that yellow or green stain from some pyro developers (PMK and in some instances ABC formulation) is a detriment to VC materials. The matter of yellowish or greenish stain is not a factor with Pyrocat developer. Pyrocat produces a tan or brown stain with most films. I have found that ABC pyro is far and away better then HC110 ( I used HC 110 for over 15 years) and that Pyrocat is a far superior formulation to HC 110 from the standpoint of not only better highlight separation but most importantly increased sharpness. I don't have much favorable experience with PMK but some folks use it and like it.
Originally Posted by John Sparks
However "your mileage may vary"