American whiskey labeled as one of these types, the whiskey must be distilled to no more than 80% alcohol by volume (160 U.S. proof) to ensure the flavor of the original mash is adequately retained, and the addition of coloring, caramel, or other flavoring additives is prohibited. All of these, except corn whiskey, must be aged at least briefly (although no minimum aging period is specified) in charred new oak containers. These restrictions do not exist for some similarly named products in some other countries, such as Canada. American corn whiskey does not have to be aged at all – but, if
Tennessee whiskey located in Tennessee and produces a whiskey product, but the product cannot be sold as Tennessee whiskey because it is not aged. Instead, it is legally classified as a corn whiskey rather than carrying the "Tennessee whiskey" label and is marketed as "Tennessee moonshine". George Dickel began production of a rye whiskey in 2012 that also cannot be labeled a Tennessee whiskey because it is produced from a rye-based mash and is not distilled in Tennessee. Most of the stages of its production are conducted under contract in Indiana, and the whiskey is then trucked to the Diageo bottling plant