Thanks for you quick responses. There's a lot of interest in PMK! To clarify a couple of points, I used PMK in the correct dilution for all tests (100:1:2), I did the resoak in used developer, and long cold water wash. No, I used tap water. Here in melbourne, Australia the water is quite low in mineral content and has a little chlorine. In the three tests, there was not much air. Would you expect much difference with a larger tank and more air?(posted 8494 days ago)