constituted by a partially transparent coating or film the outer wall 20 may have any thickness however preferably the outer wall 20 is a thin coating in the mm or sub mm range the outer wall 20 may optionally be provided with markings indicating the brand name and type of beer however such information may be provided on a separate sticker which is attached to the outer wall 20 as well the inner wall 18 and the outer wall 20 have different optical filter characteristics which will be explained in detail below fig1 c shows a diagram of typical optical filter characteristics of the transparent inner wall 18 of the bottle 10 the inner wall 18 is here shown to transmit about 90 of the incoming light from the outside the bottle 10 to the beer 14 inside the bottle 10 for all visible wavelengths and near infrared wavelengths i e wavelengths from about 350 nm up to about 1000 nm the light transmission of the inner wall 18 typically decreases in the uv wavelength range i e at wavelengths below 350 nm it should be noted that the light transmission in the uv range may vary depending on the type of glass while most glass will prevent uv transmission some kinds of glass e g quarts glass may have a higher transmission of uv light it is of course contemplated that depending on the kind of material chosen for the inner wall 18 the transmission may differ in some cases the inner wall 18 may transmit less than 80 of the incoming light fig1 d shows a first embodiment of an optical filter characteristic of the outer wall 20 of the bottle 10 the outer wall 20 prevents.