Grain Whisky is usually thought of as simply being 'filler' for blended whisky with nearly all grain whisky produced in Scotland going into blends. However in recent years there has been a growing interest in Single Grain Scotch Whisky, essentially grain whisky distilled at a single grain distillery in Scotland. There are 8 Grain Distilleries in Scotland and most are located in the lowlands. Grain Whisky is easier and cheaper to produce than malt whisky. Grain whisky can be made from any un-malted cereal grain such as wheat, rye, oats or maize, but the usual choice is wheat, which is then combined with some malted barley to help start fermentation. Distillation is carried out in a column still, also called a continuous still, patent still or Coffey still. The continuous distillation process is very efficient and produces a spirit high in alcohol, light in character with very little flavour. A gentle fruity and sweet flavour is then developed over time from maturation in ex-bourbon oak casks.