A Heavenly Spirit

At Foursquare we age our rum at a strength of 65% ABV, which is a lower cask strength than most Caribbean rums which are laid down at between 70% and 75% ABV (if they are aged at all). This means we need more casks, but it also means we get better extraction from the wood at low strength, and the most precious elements of the spirit do not evaporate out. That said, our barrels typically lose about 6% of their contents to the angels through evaporation every year. This means that after 12 years we have lost over half the volume of rum we started with.