To emphasise the individuality of each cask Authentic Collection whiskies are bottled undiluted at their natural high maturing strength and are not subject to any artificial chemical processing. Colouring is never added to Cadenhead's Single Malts nor are they subjected to any filtering that might remove natural constituents and spoil their flavours. It is uncommon for more than one cask of any single whisky to be bottled at one time. Our list therefore varies constantly and no two bottlings, even of whiskies of the same age and from the same distillery are absolutely identical. This contrasts with the practice of many other firms which attempt to obtain a uniformity by mixing together the contents of many casks.