Baking Powder Shelf Life is Longer Than You Have Been ...
Oct 29, 2013· Baking Powder Shelf Life is Longer Than You Have Been Told. It is activated by a combination of heat and moisture. Test your baking powder by mixing 1 teaspoon of baking powder with 1/3 cup hot water. Fresh baking powder should produce lots of carbon dioxide bubbles. Cold water will not work for this test, use warm or hot water. The more bubbles the fresher the baking powder.