Baking powder is a common ingredient used in many recipes, and it typically contains four main ingredients: ALUM, tartaric acid, SODIUM bicarbonate, and TALC. ALUM is a type of salt that helps to create a leavening effect in baked goods. Tartaric acid is an organic acid that helps to activate the baking powder. SODIUM bicarbonate, also known as baking soda, is a base that helps to neutralize the acidity of the tartaric acid. TALC is a mineral that helps to absorb moisture and prevent clumping. COCOA is sometimes added to baking powder to give it a chocolate flavor.