I've been 'practicing' with my recently acquired Bush and BPF 200 @ 200. I have been tray developing in PMK 1+2+100, N @ 12:00, not using acid in the chain and coming out with pin holes in the emulsion. I fix in TF-4 (1 + 3) for two 2 minute baths with near constant agitation. The pin holes print black as opposed to the Photo-Flo goop that prints white. I thought pin holes were caused by some form of gas but if this is the case I have no idea how to rid the chemicals of gas. Does anyone have ideas/solutions?