I've read that gassing in stop bath shows up as black/dark bubbles, but these are light. 4x5 film, SP445 development tank, Rodinol 1:50 8 minutes, I fill the beaker with water then dribble a little 28% acetic acid into it (less than a teaspoon), the idea is that as it pours into the tank it mixes itself. I presoak in water with heavy agitation, agitate developer at start then exponential 1 min, 2 min, 4 min etc. I agitate the stop bath and use it for 30 sec or less, agitate fix at start then about every minute. I've never had this problem before. I know for certain the film was in the SP445 holder with emulsion-side out so it is not an issue with the film holder bars. Could it be from filling the SP445 tank since it takes a while to fill- maybe I need to tap it on the table as I fill it? but presoak should have eliminated any chance of air bubbles?
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