Is calumet baking powder still safe to used after its expiration date?

It is generally not recommended to use baking powder after its expiration date. Baking powder contains baking soda, an acid, and a starch. Over time, the acid can react with the baking soda, releasing carbon dioxide gas and causing the baking powder to lose its effectiveness. Additionally, the starch in baking powder can absorb moisture and become clumpy, which can affect the texture of baked goods.

While baking powder may not be harmful to consume after its expiration date, it may not work as well as it should and could result in baked goods that do not rise properly. If you are unsure whether baking powder is still good, it is best to err on the side of caution and discard it and use a fresh batch instead.