Baking powder

Baking powder is a dry chemical leavening agent often used in baking. The most commonly used baking powder today is double-acting baking powder. Double-acting baking powder contains two acid salts: one which reacts at room temperature and the other which reacts at high temperature. If too much baking powder is added, it might leave a bitter aftertaste. Aluminium-free baking powder will not leave this aftertaste.