During the 1780s, malt and grain spirits in Ireland and Scotland underwent a major flavour transformation. Consumers desired whisky that was well stored in a cask, as time in wood made whisky mellower, richer, and more complex in flavour. The superlative container was the ex-sherry cask.
Earlier, uisge-beatha and proto-whisky had little or no wood maturation, except for brief exposure in transport from still to consumption. It was either consumed raw or, preferably, compounded with herbs, spices, and sweeteners, often drunk as toddies, the cocktail precursor. Cheaper than buying new casks, distilleries began to refill unclaimed emptied ex-wine, brandy, and rum casks to store whisky, where the residual alcoholic flavours and second-use wood suited the flavour development of barley-based malt whisky. The sherry butts from southern Spain imparted highly desirable…
