A method and apparatus for the storage and/or maturation of an oxygen sensitive liquid beverage including: a vessel or tank adapted to hold a quantity of the liquid therein, said vessel having a low oxygen transfer rate from the atmosphere facilitating the reductive storage of said liquid; and a means of accommodating a gas permeable membrane, said gas permeable membrane having a high oxygen transfer rate relative to the vessel; wherein said membrane is in contact with said liquid thereby increasing the exposure of said liquid to oxygen in result.
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