A closure is whatever seals a wine bottle — natural cork, technical or agglomerated cork, synthetic stoppers or screwcap. Closure choice affects how much oxygen reaches the wine and thus how it ages. Natural cork allows a tiny, variable exchange suited to long aging but risks cork taint; screwcaps give a tighter, more consistent seal favoured for fresh, early-drinking wines.
WHY IT MATTERS FOR COLLECTORS
Closure is no longer a quality signal: many top producers use screwcaps for ageworthy whites. With cork, taint (TCA) remains a real risk, so collectors note closure type when assessing aging and bottle variation.
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