How to tell if your wine has gone bad - Wine Folly

An experienced drinker can tell almost instantly if a wine is past its prime. Question is, how do they do it? Well, this comes with a little practice, and here’s what to look for:

How it will look

Wines go bad when they are left open for too long. While some claim that open wines last for weeks, most will lose their luster after just a couple of days, so it’s wise to store open bottles properly. First thing to look at is the color and condition of the wine.

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http://winefolly.com/tutorial/how-to-tell-if-wine-has-gone-bad/