The quick answer
A wine fault is an unwanted condition caused by contamination, oxygen, heat, light, storage, or winemaking problems. Damp cardboard and muted fruit suggest cork taint; browning and stale apple can suggest oxidation. Some unusual aromas are stylistic at low levels, so compare the whole wine before declaring it faulty.
Symptom checker
What seems wrong with the wine?
Select the closest clue. This is a tasting aid, not a laboratory diagnosis.
Most likely explanation
Possible cork taint
Cork taint commonly suppresses fruit as well as creating a musty smell. Air does not reliably fix it. Compare with a sound bottle or request a replacement.
When several people notice the same unexpected defect, compare another bottle before blaming glassware, food, or personal sensitivity.Cork taint and oxidation
Cork taint is commonly associated with TCA and may smell like damp cardboard, a musty basement, or wet newspaper while suppressing fruit. Oxidation can deepen color, flatten freshness, and create bruised-apple, nutty, or sherry-like notes where that character is not intended.
| Clue | Possible cause | What to do |
|---|---|---|
| Damp cardboard; muted fruit | Cork taint | Return or replace the bottle |
| Brown color; stale apple | Excess oxidation | Check style, age, and closure |
| Cooked fruit; pushed cork | Heat damage | Avoid drinking if quality seems compromised |
| Vinegar or nail-polish intensity | Volatile acidity | Low levels may be stylistic; high levels are faulty |
Heat, light, reduction, and sulfur
Heat can make wine taste cooked and may force the closure outward. Light can damage delicate aromatic and sparkling wines. Reduction can create struck-match, rubber, or rotten-egg impressions; mild forms sometimes dissipate with air, while severe examples persist.
- A musty smell is not improved by decanting
- Air may soften mild reductive aromas
- Intentional oxidative styles such as Madeira are not faulty
- Sulfur dioxide is a protective wine additive, not the same as a sulfurous smell
Sediment and crystals are often harmless
Older red wine may throw pigment and tannin sediment. Clear crystals can be tartrates. Neither automatically signals spoilage. Stand an older bottle upright and decant carefully if you want to leave sediment behind.
Common questions
Quick answers
Is sediment a wine fault?
Usually no. Tartrate crystals and age-related sediment are harmless natural deposits.
Can a corked wine be fixed?
No reliable home method restores the muted fruit. Return the bottle when possible.
Sources and further reading
We use established educational and regulatory references, then write original explanations for everyday readers.
WSET: How to taste wine ↗OIV: Sulfur dioxide practices ↗