If you've been doing your research into home aging, you might have heard the term "angel's share" and wondered what it is. When you age whiskey in barrels, some of it evaporates, which leaves you with less than you started with. The longer you age it, the more you lose. This portion of evaporated whiskey is referred to as the angel's share. We're not suggesting that angels really took it, but it's good to learn the lingo.