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- Baker's Ammonia, also known as Ammonium Carbonate, Ammonium Bicarbonate, and Hartshorn, is a type of water-soluble, non-toxic white crystalline salt used as a classic leavening agent in flat, baked goods. It was commonly used by bakers before the invention of baking powder and baking soda to make extra crispy cookies and crackers. Ammonium Carbonate dissolves in hot water.