PMK developer is advertised and widely recognized as developing general stain. If you will look at any of the Bergger-PMK ads in the magazines it is readily apparent. I personally don't think that general stain is a wonderful attribute since it decreases negative contrast. I much prefer other pyro formulations such as ABC or Pyrocat HD. The reason that I prefer those formulations is that they do not develop general stain in the same way that PMK does. The stain that the ABC and Pyrocat HD formulations develop is proportional to the negative density. The effect of the proportional stain is to increase negative contrast with greater mid and high value separation.