Ammonium Bicarbonate Also Known As: ABC, Ammonium Salt of Carbonic Acid, Bicarbonate Salt of Ammonium, Hartshorn, Hornsalt, Volatile Salt or Vol Origin: Germany and Norway Ingredients: Ammonium Bicarbonate Taste and Aroma: Slightly acidic ammonia aroma which dissipates when cooked. Uses:Leavening agent for flat breads and crackers, Chinese Steam Buns and almond cookies. Substitutes: Baking Soda and Baking Powder. Fun Fact: Although ammonia gives off a pungent odor, it dissipates when heated in low-moisture baked goods like flat breads and crackers. Do not use Ammonium Bicarbonate as a leavening agent in moist, bulky baked goods (like cakes) as it may produce an unpleasant taste, odor and green color.