Before going to bed last night, I had a small dram of Black Bush. This bottle has been open for over 16 months and is approaching 1/4 full.
For the first six to eight months (first 1/2 of the bottle) after opening the bottle, I got a really nice fresh-cut red apple note (more sweet, less tart than a green apple) on the nose and palate. I haven't experienced that particular note (at least to any noticeable, consistent degree) in any other whisk(e)y that I have tried. Alas, that note eventually dissipated and for the next several months (the next 1/4 of the bottle level) the BB seemed to emphasize what I assume to be the grain whiskey component to a much greater degree (more bitterness...not unpleasant, but not nearly as enjoyable).
Then, all of the sudden, last night when I had a dram the sherry influence came on in spades. A really rich chocolate fudge note was the predominent feature on the nose and palate. This was accented by oranges and sweet red berries. It was my single best dram of BB that I have had, and I now know the basis for one of the most positive reviews that I had read about it last year (on Connosr), which put the BB on my radar of whiskies to purchase. I had started to slightly waver in my enthusiasm for the BB, and my willingness to re-stock it in my cabinet in the future, but last night was a revelation.
The wishlist is always growing...