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For a good long time if it is kept properly stored. Here is a test you can use to make sure your baking powder is usable .
Put water in a teaspoon and sprinkle a little bit of the baking powder in the water. If your baking powder is good the water will fizz sort of like a soda does. if you don't hear or see the fizz then baking powder is no good and should be tossed out.
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∙ 15y ago
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