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PURE Ammonium Bicarbonate (2 lb.),Traditional Leavening Agent Used in Flat Baked Goods such as Cookies or CrackersPure Ammonium Bicarbonate is Pure Bakers Ammonia also called Hartshorn. Traditional Leavening Agent Used in Flat Baked Goods such as Cookies or Crackers. PURE AMMONIUM BICARBONATE: Scent of Ammonia, Dissipates with Baking Leaves No Salt..