Malt whisky whisky regulations require malt whisky to be made in pot stills using water and malted barley without the addition of any other cereals, and the whisky must be aged for at least three years in oak casks. The use of new barrels is not required. Caramel coloring can be added, but no other additives are allowed. Irish whiskey regulations are almost identical to Scotch regulations. Malt whiskey must be distilled in a pot still from a mash of 100% malted barley, which may be peated or unpeated in character, although unpeated malt is typically used. All Irish whiskeys must be
Laphroaig distillery distillery identifies Charles by his title of Duke of Rothesay, as he is recognised in Scotland. The 15-year-old was reportedly the prince's favourite Scotch whisky. Laphroaig calls itself "the most richly flavoured of all Scotch whiskies", and is most frequently aged to 10 years, although the 15-year-old variety is common (the 27-, 30- and 40-year-olds are rare and expensive; the 18-year-old was discontinued in late 2015). The whisky has a peaty/smoky flavour. The "Laphroaig Quarter Cask" was introduced in 2004. This expression is aged in smaller casks and is not chill filtered. Due to the smaller barrels used, the oak