Can I drink brown wine?
But it sounds like you're wondering if a wine spoils as it gets older, and the answer is no. The alcohol acts as a preservative. ... In that case, the wine will have lost its fruit flavors and taken on nutty notes, and the color will have started to turn brown. It's not harmful, but it won't taste good.
What does it mean when wine turns brown?
Generally speaking, however, browning is a sign of the wine going stale from too much exposure to oxygen. Although wine that has gone bad is typically associated with the smell and taste of vinegar or unwanted effervescence, oxidation itself can actually lead to "nutty", "applesauce", and "burnt marshmallow" aromas.