Ammonia smell in flour?
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An odd question: The large plastic-ware container that I use for storing unbleached AP flour holds about 6 pounds of flour. I empty it completely and run it through the dishwasher twice a year or so, so I'm always fairly certain that there's no flour in it more than six months old. And I've stored the same bin in the same place for the last ten years, so no new variables have been introduced in storage.