geographical area of the source, or simply market the product using their own brand name without identifying their source. This may, in some cases, give the independent bottling company the flexibility to purchase from multiple distillers without changing their labels. Types There are two basic types of Scotch whisky, from which all blends are made: Single malt Scotch whisky must have been distilled at a single distillery as a batch process using a pot still distillation process and made from a mash of 100% malted barley. Single malt means that the whisky has not been blended elsewhere with whisky from other distilleries. A single malt Scotch must be distilled in Scotland and matured in oak casks in Scotland for at least three years, although most single malts are matured longer. Single grain Scotch whisky is a Scotch whisky distilled at a single distillery but, in addition to water and malted barley, may involve whole grains of other malted or unmalted cereals. "Single grain" does not mean that only a single type of grain was used to produce the whisky; rather, the adjective "single" refers only to the use of a single distillery (and making a "single grain" requires using a mixture of grains, as barley is a type of grain and some malted barley must be used in all Scotch whisky). Grain whisky can be distilled continuously in Continuous Stills or Column stills. Excluded from the definition of "single malt Scotch whisky" or "single grain Scotch whisky" is any spirit that qualifies as a blended Scotch whisky. This exclusion is to ensure that a blended Scotch whisky produced from single malt(s) and single grain(s) distilled at the same distillery does not also qualify as single malt Scotch whisky or single grain Scotch whisky. Nearly 90% of the bottles of Scotch sold per year are blended whiskies. Three types of blends are defined for Scotch whisky: Blended malt Scotch whisky means a blend of two or more single malt Scotch whiskies from different distilleries. Blended grain Scotch whisky means a blend of two or more single grain Scotch whiskies from different distilleries. Blended Scotch whisky means a blend of one or more single malt Scotch whiskies with one or more single grain Scotch whiskies. The five Scotch whisky definitions are structured in such a way that the categories are mutually exclusive. The 2009 regulations changed the formal definition of blended Scotch