Can a bottle of liquor go bad after you’ve opened it?
In most cases the liquor won’t go bad, but the flavor and potency can change a bit if the bottle has been opened for some time, said T. Benton Jenkins, director of communications for the Distilled Spirits Council of the United States.
Over several years, some of the water in the bottle can evaporate, which would leave the liquor slightly stronger because the ratio of alcohol to water would increase. If the bottle isn’t well sealed, the taste can be affected, but it won’t go “bad,” Jenkins said.
How much it is affected depends to an extent on the type of liquor, whether it’s a straight distilled spirit such as vodka or a cordial, which has other ingredients. The key is keeping the bottle well sealed and storing it away from sun and moisture, Jenkins said.
The exception is cream liqueurs, which must be refrigerated after opening or the product will suffer.
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