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Michael W. Crowder, Professor of Chemistry and Biochemistry, Miami University

The complex chemistry behind America's spirit – how bourbon gets its distinctive taste and color

Most bourbon is made in Kentucky. Catherine Falls Commercial/Moment via Getty Images

Few beverages have as rich a heritage and as complicated a chemistry as bourbon whiskey, often called “America’s spirit.” Known for its deep amber hue and robust flavors, bourbon has captured the hearts of enthusiasts across the country.

But for a whiskey to be called a bourbon, it has to adhere to very specific rules. For one, it needs to be made in the U.S. or a U.S. territory – although almost all is made in Kentucky. The other rules have more to do with the steps to make it – how much corn is in the grain mixture, the aging process and the alcohol proof.

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