Does the bottle have a best by or an expiration date which has passed?
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I just got some isopropyl alcohol. It has an expiration date.
Oh????
Does it turn into ethanol? If so, is that date now its vintage?
It will still be good for certain uses but using it for pre-injection cleansing is not advised. You can still wipe down surfaces with it or use it for ear drops (to prevent water in the ear when swimming) and such when full strength may not be necessary.