Scotch whisky is a whisky produced at a distillery in Scotland, and must adhere to rules set forth in the Scotch Whisky Order of 1990. Scotch must be distilled from only two ingredients: water and malted barley. Fermentation can only be obtained using yeast. The spirit must then be distilled to a strength of less than 94.8 percent by ABV (alcohol by volume) so it retains the flavor of the raw materials.
No other substance can be added to Scotch when it is bottled except of water and caramel spirit. The four categories of Scotch are: single malt, vatted malt, blended and single grain. Scotch must have been aged for at least three years, with labels signifying the youngest scotch barrels used in the mix or blend. Most Scotch drinkers agree that good scotch must be at least 10 years in the barrel to obtain desired results.