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www.reference.com/article/wine-bad-after-opening-19d84758a9b6a85e

If kept for long enough, wine eventually turns into vinegar after being opened. Depending on one's taste for vinegar, this can be a plus or a minus.

www.reference.com/article/wine-bad-a8277d95928987d5

Wine goes bad after opening from prolonged exposure to oxygen and the action of lactic acid-producing bacteria. Oxygen exposure oxidizes chemical components of the wine, while the bacteria ferment the wine in the same process used to produce wine vinegar.

www.reference.com/article/boxed-wine-bad-dde3d5496b9f4cd2

Boxed wine does go bad but it stays fresh between 30 to 60 days after opening. Boxed wine are basically wine that is contained in a bag with a cardboard box outer covering. To dispense the wine, a hole is cut along a dotted portion on the box and a spout or a tap is pul...

www.reference.com/article/long-wine-stay-good-after-opening-a5fdb47ceec6cf7b

Wines stay fresh for a couple of days after opening; about 2 days for white wines and 3 days for reds according to Real Simple. Because whites have more acid, they tend to stay fresh slightly longer.

www.reference.com/article/long-red-wine-last-after-open-e502c2f106f49d07

If stored properly, a bottle of red wine can last up to a week after being opened. Without proper storage, it will only last a day or two.

www.reference.com/article/long-red-wine-keep-after-opening-70ea12dd5d0e454e

In general, red wines start to lose their aromas and flavors and begin to taste acidic 2 or 3 days after opening. However, the more bodied a wine is, the more likely it is to have a higher tannin-content. Tannins reduce a wine's deterioration upon contact with oxygen an...

www.reference.com/article/wine-need-refrigerated-after-opening-238efc8bff4a80f3

To preserve the freshness of the wine, it is best to store open wines in the refrigerator. Allow refrigerated red wines to warm to room temperature before serving.