Cream of tartar, also called potassium bitartrate, or potassium hydrogen tartrate, is a white, crystalline substance with a slightly acid taste. It is found in grapes and other fruits. It is used in baking recipes and in the manufacture of baking powder. It is also used in tin-plating metals and as a laxative in medicine. Cream of tartar comes from argol, the crude tartar sediment that settles in wine barrels. See also Baking powder.
