Conrad, that's certainly valuable advice. In my case, although I have some smaller bottles that I have ordered at various times for this and other purposes, my standards have shrunk from the gallon jugs I used to use, to halves and quarts. The alleged quart bottles I use actually hold more like 34+ ounces, not 32, and the dilution would therefore be significant. Space is a factor for me. I already have several quarts each of print developer and fixer stored in the basement as a result of saving good money by buying gallon size rather than quarts/liters. Those stored bottles are full to the top, while the ones in my darkroom, currently in use, have some space. When they get to about 2.3 or a half, I transfer to whatever 16- and 8-oz bottles I have. We don;'t have central AC, so while the winter is not a problem, the summer gets hot in the darkroom. C'est la vie. The main issue is that I don't use the chemistry as regularly or as much as I did when I was a pro.
I began this thread wondering about an anti-oxidation product. The advice, as usual, has been plentiful and valuable. Thanks to all.
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