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MANUFACTURE.) Baking Powder Leavening Agents.—Much of the bread baked in the home is of the hot bread or biscuit variety and is made by adding chemical leavening agents to the flour and water, or milk mixture. Baking powders are used in very large quantities in the production of biscuits, cakes and special forms of bread commonly known as doughnuts, pancakes, etc. The formulae for baking powders vary somewhat, but all depend upon the release of carbon dioxide.