in the range of wave length of 3 30 microns when b is selected to contain at least 30 of iron it emits radiation in the wavelength range of 18 to 30 microns and the aging process is most efficient since the spinel ab 2 o 4 absorbs environmental radiation and converts it to far infrared it is a virtually maintenance free source of radiation for the wine aging process of this invention the wrapper comprises ground spinel ab 2 o 4 mixed with epoxy or other resins such as abs pvc and a substrate which has been coated with the mixture said substrate may be a film such as polyethylene pvc or styrofoam u2122 in the form of two half shells coating methods are known to those skilled in the art the wrapper can be a tube shell or plain sheet so long it is adaptable to the shape of the wine container the wine aging process comprises placing the wrapper around the container it is found that it takes only thirty minutes to age the wine a double blind test was made with two bottles of red wine from the same batch one marked a and the other one.