I have found that PMK used in an inversion tank does not produce much general stain. I don't have a lot of air in the tank, and I don't agitate a lot.
Originally Posted by Brook
The OP needs more general info at this stage, I think. The articles by Sandy King at unblinking eye are a good place to start.
Introduction to Pyro Staining Developers
If the OP is going to use variable contrast papers, the effect of stain colour on achieved contrast needs to be studied.