Wine fault
Haze and cloudiness
A wine that is not clear. Usually harmless — often deliberate — but occasionally a sign of microbial spoilage.
What you notice
Appearance
- The wine is hazy or cloudy rather than bright
- Visible particles suspended in the wine
What it is
Cloudiness alone tells you very little. A great many excellent wines are deliberately unfiltered, and cloudiness in those is a stylistic signature rather than a defect.
The distinguishing question is what the wine smells and tastes like. Cloudy wine that smells clean and tastes good is fine. Cloudy wine that also smells of vinegar, sauerkraut or mould is spoiled.
Protein haze in whites appears with warmth and is harmless, though producers usually prevent it with fining.
Pét-nat is expected to be cloudy, and clarity would be the surprise.
What causes it
- Deliberately unfiltered and unfined winemaking, which is common in low-intervention wine.
- Protein haze in white wine, which can appear when a bottle warms up.
- Sediment disturbed by moving the bottle.
- Microbial spoilage — the one cause that genuinely matters.
Can I fix it?
Sometimes
Depends entirely on the cause, and appearance alone does not tell you which. Smell it before deciding anything.
What you can do
- Smell and taste it before concluding anything — appearance alone is not diagnostic.
- If it smells clean, drink it.
- If it smells sour, mousy or of sauerkraut, do not.
What does not work
Published because a reader holding a spoiled bottle has usually already been told to try one of these. Correcting the specific wrong advice is more use than stating the right answer beside it in silence.
- Judging by clarity alone
- A cloudy wine that smells clean is usually unfiltered or protein-hazed and is fine. A clear wine can be badly spoiled. Clarity is close to uninformative on its own.
Is it safe to drink?
Harmless in itself — check the rest
This on its own is not a health concern, but it is worth checking for the other signs described below before pouring.
Almost always. Cloudiness by itself is not a safety issue. Wine’s alcohol and acidity make it a hostile environment for organisms that harm people.
Haze alone is not a safety question. Combined with a visible film on the surface, a pushed or weeping cork, active fizzing in a wine that should be still, or a smell of rot rather than of wine, treat the bottle as spoiled and pour it away.
Can I take it back?
Only if it also smells or tastes wrong. Many wines are cloudy on purpose, and returning one for being unfiltered is a misunderstanding.
Sources
Sources consulted
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