Rumford Baking Powder is a lightweight ingredient, 8oz of baking powder in a 16oz jar is pictured.
Leavening carbon dioxide is released by the reaction of sodium bicarbonate with monocalcium phosphate in the presence of moisture. About 60% is released at batter temperature, and the rest is released in the oven.
Store in a cool, dry place and keep container tightly closed. Heat and moisture are harmful and should be avoided.