From a recent post at the Shillery...
"Joey", here's the deal. While brighter minds than mine feel that some changes actually occur in the bottle, it is only after many years (think 20 years on your shelf). So that's out. On the other hand - and just like wine - a bit of airing really does make a difference.Joey: "(I recently got) a bottle of Dictador 20 some months ago... The rum however was far from what expectations the bottle raised.
The first whiff .. almost rubbery... and lots of alcohol. The first sip... rubbery anise... plenty of after burn... pretty dry and... lacked the typical vanilla aroma of an old casked rum. It wasn't what I was hoping for, so it sat on the shelf untouched for quite a while.
Recently I gave it another try, and I'm almost certain that oxidation made it bloom in some strange way, because now it's completely different. (It's now) much softer and the rubbery anise body seem to have subsided... more of a sweet nature... lots of vanilla and rich honey tones. Biased by my first opinion I offered some to a couple of my fellow rumheads, and they just loved it."
We have frequently cited this in our reviews and have noted that the first drams out of the bottle usually fall short. Our rule: until the level of rum reaches the shoulders of the bottle, you really don't know what that rum tastes like.
So what's happening?
We believe this is a combination of cork effect, and certain unpleasant volatiles airing out. Whatever the reason, it's true. Your experiences?