Opened baking powder will expire, and its shelf life is 24 months.

Opened baking powder will condense into lumps due to moisture, so it can be used, but the effect will be reduced.

Baking powder is a compound additive, mainly used in the production of flour products and puffed foods. It is one of the commonly used materials for making bread and desserts. Its function is to make the dough rise and have a better taste when eaten. Baking powder contains many substances, the main components of which are sodium bicarbonate and tartaric acid. It is usually a compound of carbonate and solid acid. When carbonate comes into contact with water and acid, it dissociates into several substances. During this process, carbon dioxide is released , but does not produce flavor substances, so the taste of the product will not be affected.