The bottle was sealed tight, but had been opened at some point in time. Not knowing the age of the bottle made it all the more difficult to determine if
evaporation had taken place or if it was just that the vodka had been consumed. Eighty proof spirits contain a high alcohol content that helps to prevent the spirit from “turning” over time. Vodka is one of the more stable spirits that can be stored for a long time. However, once opened it will begin to very slowly evaporate and possibly start to lose flavor. Since this bottle was stored in a cool and dark place, light exposure was not a contributor to altering the flavor of the vodka.
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