The moment you uncork that container to have a sip, wine is revealed to air, and also the minute it is subjected to air, the oxidation happens, which ages it too swiftly. Exactly how do you know if your wine has been oxidized? It will look brownish, as well as will not taste as fruity as it need to (or has in the past). Oxidization can be a result of a damaged cork, or a cheap custom wine stoppers being maintained as well long after having actually been opened. Wine could also sour when subjected to excessive light, called lightstrike.