What Does "Corked" Wine Mean, and How Do You Know?

"Corked" doesn't mean bits of cork floating in your glass, that's a different, harmless annoyance. Corked wine means the wine has been contaminated by a compound called TCA, and it is one of the most common quality flaws in the entire wine industry.

What TCA actually is

2,4,6-trichloroanisole (TCA) forms when naturally occurring compounds in cork bark react with chlorine-based sanitizers or certain molds during processing. It migrates into the wine and, even at concentrations of a few parts per trillion, the human nose can detect it. TCA doesn't just add a bad smell; it actively suppresses fruit aromas, so a corked wine often tastes flat and muted as much as it smells off.

How to identify it

• The classic sign: wet cardboard or damp basement. The most recognizable descriptor, and usually unmistakable once you've smelled a genuinely corked bottle.
• Musty, moldy newspaper. A close cousin of the cardboard note, particularly at lower TCA concentrations.
• Muted, flat fruit. Sometimes there's no obvious off-smell, just a wine that tastes strangely dull and lifeless compared to how it should.
• It will not blow off with air. Unlike some other wine faults that soften with time in the glass, TCA taint does not improve; if anything it becomes more apparent.

How common is it, really

Industry estimates historically put cork taint at somewhere between 1 in 20 and 1 in 50 natural-cork-sealed bottles, though the rate has fallen meaningfully as cork producers improved processing. Screwcaps and synthetic closures are immune to TCA specifically, which is part of why quality-focused producers of everyday wines increasingly use them, reserving natural cork for wines meant for long-term aging where its slow oxygen transfer genuinely helps.

What to do about it

At a restaurant, a corked bottle is always sent back, without hesitation or apology; it's a manufacturing fault, not a taste preference, and every wine list expects the occasional return. At home, a corked bottle from a retailer is worth taking back too; reputable shops replace them without argument. The one thing that doesn't work is waiting for it to air out: TCA taint does not fade.

For producers, closure choice and any batches affected by TCA are exactly the kind of quality event that belongs in permanent records, both to track supplier patterns and to answer a distributor's complaint months later. Oenova's audit trail keeps that history attached to the lot. Free plan, no credit card.