What does the "XXX" on a Moonshine jug mean? 

The XXX on moonshine jugs is a classic symbol. It has been caricatured and cartooned many times in modern portrayals of the moonshiner. Everyone instinctively knows that “XXX” written on a jug indicates that it contains moonshine, but what does that symbol mean and why did moonshiners’ scrawl that on their jugs?

In the old days, before the invention of more modern distilling techniques like thump kegs and reflux stills, moonshiners used a basic pot still – the simplest of all types of stills. It’s made up of two components: a boiler to cook the mash and a condenser to collect and cool the alcohol vapor back to a liquid.

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While it is an effective device, you don’t get pure alcohol when you run a batch through the first time. The fermented mash, which is very similar to beer, starts out at about 5-10% alcohol by volume (ABV). When you run the mash through a pot still, the product coming out of the other end contains about 30-40% alcohol, the rest being mostly water. This is called “singlings.” (While the first run produces liquor at about 60-80 proof and is drinkable, you wouldn’t want to drink it since it still has quite a bit of off flavors carried over through the water from the mash. To raise the alcohol content, you must save up all the results of your first runs, and then run all of that through the still a second time. The second run raises it up to the 60-70% ABV range. Moonshine that had been run through the still three times was very close to being pure alcohol, above 80% ABV. 

The “XXX” signifies how many times the moonshine batch had been run through the still. Three X’s indicated that it had been run through three times and that the shine was pure alcohol.

Any jugs like that would have to be quite old since moonshiners moved to half gallon mason jars many years ago……