
Cream of tartar, also known as potassium bitartrate, is a powdery, acidic byproduct of wine making. It is a white, odorless powder with a slightly tart flavor. Its fine texture makes it ideal for various culinary applications, especially when you need to stabilize egg whites, prevent sugar crystallization, or add a tangy lift to baked goods. Many bakers use cream of tartar as a crucial ingredient in meringues and souffles. Cream of tartar also works well with baking soda in making baking powder, so is helpful as a leavening agent.
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Cream of tartar should be stored in an airtight container in a cool, dry place, away from direct sunlight and moisture. Properly stored, it can last indefinitely, though its potency may gradually diminish over time. Avoid storing it near strong-smelling foods as it can absorb odors. It does not require refrigeration or freezing.