Wine Fault

Ullage Oxidation

Additional

Ullage oxidation develops when wine in bottle or barrel has excessive headspace, allowing oxygen to degrade color, aroma, and flavor over time. Old bottles with low fill levels and untopped barrels are classic sources.

Also known as: Headspace oxidation, Low fill oxidation, Cellar ullage

Typical severity: Medium

Cause

Prolonged oxygen contact through large headspace in bottle neck or barrel, accelerated by warm storage.

How it occurs

Cork shrinkage, seepage, evaporation through cork, and failure to top barrels create ullage. Oxygen ingress browns wine and develops nutty, flat, oxidative character distinct from quick heat damage.

Prevention

Proper fill levels at bottling, quality corks, regular barrel topping, inert gas blanketing, and cool humid cellars.

Descriptors created

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Commonly confused with

Common wine styles

Common grape varieties

Common regions

Related winemaking techniques

Serving implications

Beginner explanation

A old bottle with wine below the cork shoulder and tawny color likely suffered ullage oxidation — not graceful maturity.

FAQ

Is ullage always a fault?
In aged collectibles, some ullage is expected — but beyond low-shoulder fill, oxidative fault risk rises sharply.
Can ullage oxidation be slowed?
Cool, humid storage slows progression, but existing ullage damage to aroma and color is irreversible.

Related ontology entities

See also

Fault identification guidance reflects common wine education practice and may vary by wine style, age, and context.