Believe it. At least, I think so. I love, **LOVE** Chartreuse. I have a number of vintage bottles, a mix of green and yellow. Also, I have a particularly old bottle, i.e. no UPC code, tax strip, etc. The color of the liqueur inside is markedly different from the more recent bottles I have, which themselves are dusties from the early 80's. The old, old bottle is a brilliant, beautiful green.
The bottle on the left is the old non-UPC bottle. The bottle on the right is the dusty from the early 80's.
On another note, anyone heard of the 86 proof yellow? I have two mini bottles of it, but everything else I have is 80 proof.
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