All straight Bourbon whiskey must be distilled from a mash that includes no less than 51% corn. It should be distilled at no more than 160 proof, barrelled at no more than 125 proof, and bottled at no less than 80 proof. Straight Bourbon whiskey must age for at least two years in charred white oak barrels, and unlike other spirits, distillers can’t add coloring, or blending agents to straight whiskey, making the process of creating great Bourbon a true craft.