Thanks, Doremus, I forgot to mention that the 28% stock requires further dilution. FWIW, my use of acid stop or plain water generally is tied to what film developer I'm using on what film. For example, if I'm using a fast acting developer like HC-110(B) I'll tend to use an acid stop because the overall development time is short and that's a vigorous formula. When developing any film in any pyro formula, I always use plain water. For paper, it's citric acid and I mix fresh after about 10 8x10 sheets or equivalent.
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