Paul John (whisky) evaporation during aging, known as the angels' share, is also higher in India, at 10–12% per year, than in Scotland, where the annual evaporative loss is about 2%. This leaves a hogshead with only 150 bottles left in it, after three years, compared to around 350 in a Scotland. Michael John describes it this way, "Whisky matured at these temperatures simply cannot be aged for the kind of time expected with Scotch, even trying to mature our whisky for just 10 years would leave barely a bottle of liquid in the barrel. Fortunately, the heat actually speeds up the maturation
Scotch whisky or "non-chill-filtered" has not been through a filtration process during bottling that removes compounds that some consumers see as desirable. Whisky is aged in various types of casks—and often in used sherry or port casks—during distinct portions of the maturation process, and will take on characteristics, flavour and aromas from such casks. Special casks are sometimes used at the end of the maturation process, and such whiskies may be labelled as "wood finished", "sherry/port finished", and so on. There are two basic types of Scotch whisky, from which all blends are made: Excluded from the definition of "single grain Scotch