Baking powder is a dry chemical leavening agent.A mixture of carbonate or bicarbonate and a weak acid. The base and acid are prevented from reacting prematurely by the inclusion of a buffer such as cornstarch.
Corn Steep Powder (CSP) is a fine, yellow to yellow-brown, water-soluble powder made from Corn Steep Liquor, which is derived from the process of corn wet milling.