For a good example of PMK ehancing effective accutance against a blurred background, see http://www.well.com/~wab/J.D._On_Bank.JPG(posted 8933 days ago)I don't see how anyone can claim to evaluate PMK's effect on actual or perceived accutance using 35mm exposures. Hutchings says rather clearly, as I recall, that the effects of pyro are rather negligible in the tone spectrum of a 35mm neg. IIRC, he says that PMK is the only pyro developer yielding a noticeable effect in 35mm.