Update from session using Edwal Ultra Black today. Started a darkroom session and printed a few 8x10's then took a break and started up again developer went south after about 4 hours in the tray and around 8-10 8x10's. Have some Dektol that I plan to use after I use up the current bottle of UB, should be in a week or so. Forgot to mention, dil. was 1+10 (or 1:11).