Scotch whisky whisky used. An age statement on the bottle, in the form of a number, must reflect the age of the youngest whisky used to produce that product. A whisky with an age statement is known as guaranteed age whisky. Scotch whisky without an age statement may, by law, be as young as three years old. In the early 21st century, such "No age statement" whiskies became more common, as distilleries responded to the depletion of aged stocks caused by improved sales. Labels may also carry various declarations of filtration techniques or final maturation processes. A Scotch whisky labelled as "natural"
Straight whiskey water, cordial, or other mixer. Thus, in bartending terminology, "straight" is typically synonymous with "neat". The core aging requirement that defines a whiskey as "straight" is if the distillate has spent at least two years stored in charred new oak barrels, except corn whiskey which must use uncharred or used oak barrels. The spirit mellows in this time and penetrates the wood, extracting many of the flavor compounds and caramelized wood sugars. A straight whiskey that has been aged less than four years is required to be labeled with an age statement describing the actual age of the product. Other