The general consensus is that while you can use water as a stop bath when printing, an acidic stop bath( acetic or citric acid) is a lot better. This is just my reasoning why this is better but I suspect that whereas water stops negative as well as paper development, time is on your side with a negative that has maybe required 10 or more minutes to develop, a sheet of paper takes 60-90 secs so the few extra seconds needed to stop paper developing is much more critical
Mike
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