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There's an expiration date that helps, too. Good to know that tip, though - thanks for posting!
Although I'm one of those persons who uses things after they've expired, since I trust my nose.
One thing I noticed, last time I bought baking powder, is the cans are a lot smaller. Great idea, since I don't use baking powder as near often as I use baking soda. Less to throw out when it does get old!