Baking powder

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Replace Baking Powder Every Six Months
Leavening agents like baking powder do have a shelf life (old ingredients are often the reason for flat baked goods), but don't automatically assume a canister is useless if it's past the six-month mark. You can test yours by sprinkling a spoonful into a cup of warm water; if it makes the water effervescent, it's fine to use.
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