I have a heavy crystal decanter I’ve been using for years. A while back I was having some guests for a week, and thought I’d save some money and grabbed a bottle of Jim beam to put in it, as opposed to the higher end I tend to go for, because none of my guest cared about Bourbon. I noticed the level going down further than I had consumed. This has never been an issue before, so I figured someone had just nipped it while o was asleep. The next day, there was condensation on the inside, and the level had dropped further.
Since I’d been using the decanter for so long, I assumed the frosting on the stopper had rubbed off and it no longer sealed.
When it was empty, I refilled it with larceny, my standard, and to my surprise, it didn’t evaporate at all for weeks.
Last night, I refilled it with beam again, and this morning, it had dropped and there was condensation on the side.
What really confused me, is Jim beam has a lower alcohol content than the Bourbons I usually fill the decanter with, so I would think it would evaporate as readily.
Why does only this one brand evaporate?
Quick searching gave me no results
Tldr: Why does Jim Beam evaporate in my decanter while nothing else does?
My suspicion is that your stopper isn’t sealing well, possibly from wear or just odd positioning. If you feel like ruining what’s left of that Jim beam in the decanter you can run a little experiment. Clear the condensation out of the decanter and mark the current level. Leave it for a week and see if the level dropped to establish a baseline. After marking the change, coat the stopper in Vaseline and leave it for another week. See if that helped or not. If it helped then you’ve got a leak
A quicker way to eliminate a variable would be to pour a glass of each to the same level and leave them both out for a day or two. If the levels remain consistent, it’s definitely something about the decanter.