I've been trying a variety of developers over the past year or so and it's been very interesting to experiment for me. One that I hadn't gotten around to until just recently was Sandy's PyroCat-HD. I don't keep Potassium Carbonate around for anything else but I finally mixed up a batch with the Sodium Carbonate version. I hadn't realized that the pH was so high on this until I checked tonight (about 11.0). I had noticed some emulsion swelling and this is what got me checking pH levels. Is this normal? Is it more apt to occur when using the sodium carbonate? The first of two rolls was done at 80°F as listed at the Massive Dev Chart and I thought this may have been somewhat the cause but the second roll exhibited some swelling, too (not as much, though). I've only tried it with 35mm HP5+ on a couple of test rolls so far and had a bit more fog than I expected at .40. Most of my B&W is done on medium format so some of this will be at better levels on that. I assume there are some long-time users of this in here who can fill me in a bit on these questions. I've attached a curve from shooting at 400 and 200 (blue line) 13 min at 70°.