You misunderstood my point about pH. High pH is not desirable in theory. In fact, to the contrary as much of the literature suggests that *low* pH is better than high pH if small grain structure is desired. My point was that I could find no difference in grain with the various developers ranging from pH of 9.3 to 10.9.
Originally Posted by jdef
When you dilute a Pyro/Tea formula there is a much greater change in pH than when you dilute PMK or Pyrocat-HD by an equal amount. Just test it yourself and you will see. This is a potential source of trouble, especially when you are trying to get as much contrast as possible out of an emulsion because if the developer exhausts too quickly because it is too energetic there will be oxidation and greater B+F.
Technical Pan is a high contrast film and one would expect that a much less energetic solution would work best with it. But I am not sure what you mean by clear winners? What other developers did you use for the comparison tests, and at what dilution and temperature? And on what do you base your conclusion that Pyro-TEA at 1:200 was the winner? Densitometry, comparison of print from different developers, or visual evaluation of the results of the negatives?