Apple cider vinegar is highly acidic, which enables it to self-preserve, but the flavor and appearance can evolve over time.

Once this happens, natural bacteria will turn the alcohol into acetic acid, which is where the pungent odor and taste of ...

All wines contain acetic acid, the active ingredient in vinegar ... This process of encouraging a wine to absorb oxygen is also called breathing. Simply pulling the cork out of a bottle may not allow ...