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"
Single malt whisky unless specified as "unchillfiltered" or "non chill filtered". Unchillfiltered whisky will often turn cloudy when stored at cool temperatures or when cool water is added to them, and this is perfectly normal. Unchillfiltered, cask-strength whisky is generally regarded as whisky in its "purest form". Unlike wine, whisky does not continue to mature in the bottle. E150A caramel colouring may be added to single malt Scotch whisky prior to bottling, to give the whisky a more rich and well-aged appearance. No other additives are allowed in Scotch whisky. This contrasts with the rules governing Canadian whisky production, which allow the addition