Here’s how you can tell if your bottle has gone bad.
- The smell is off - If the wine smells moldy or anything like a musty basement, wet cardboard, or vinegar, it’s no good.
- The red wine tastes sweet - If your bottle of red tastes like dessert wine or smells like Port, but it’s neither of these, it’s been overexposed to heat and you shouldn’t drink it.
- The cork is pushed out slightly from the bottle - It’s a sign the wine has overheated and expanded in the bottle.
- The wine is a brownish color - This shows the wine is past its prime. If a white wine darkens to deep yellow or a brownish straw color, it usually means it’s oxidized.
- You taste astringent or chemically flavors - If your wine tastes too astringent or anything like paint-thinner, it’s bad.
- It tastes fizzy, but it's not a sparkling wine - If it’s not a bottle of bubbly but it’s fizzy or effervescent, the wine has gone through a second fermentation after the bottling, so you shouldn’t drink it. But you can probably tell that when you taste it.