Potassium bitartrate, also known as cream of tartar, is a commonly used ingredient in baking. However, there are several other synonyms for this substance, including potassium hydrogen tartrate, which is its chemical name. Other synonyms include argol, crust of wine, wine stone, or even acid potassium tartrate. These synonyms all refer to the same compound, which is formed during the fermentation of grapes. The compound is used for a variety of purposes, including stabilizing egg whites, preventing sugar crystallization, and controlling the pH level of food products. It can also be used as a natural laxative and in the production of certain medicines.