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
Blended whiskey pot still, malt, and grain whiskey categories. Its production usually includes Irish grain whiskey that is produced from a distillate that "is much less intense in flavor when compared to pot still distillates ... at a strength of c. 94.5% vol." Under Scotch whisky regulations, "'Blended Malt Scotch Whisky' means a blend of two or more single malt Scotch whiskies that have been distilled at more than one distillery; 'Blended Grain Scotch Whisky' means a blend of two or more single grain Scotch whiskies that have been distilled at more than one distillery; and 'Blended Scotch Whisky' means a blend