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The typical grain mixture for bourbon, known as the mash bill, is a minimum of 51% corn, with the remainder being rye, wheat, malted barley, or some combination of these. A mash bill that contains wheat instead of rye produces what is known as a wheated bourbon. The grain is ground and mixed with water.
Whiskey is an American distilled spirit aged in an oak barrel. Bourbon is one type of whiskey, made mostly of corn.