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These simple procedures will let you test baking soda and baking powder for freshness and is worth your time if you have these products around for very long. I do a lot of baking during the holidays and throughout the year but I still check often to make sure my ingredients are fresh.
1 tablespoon white vinegar
1/2 teaspoon baking soda
Add baking soda to vinegar. If mixture does not fizz the baking soda is not good.
2 tablespoons warm water
1/2 teaspoon baking powder
Mixture should become foamy with bubbles. If you do not get this reaction, the baking powder is not good.
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