Closure and ageing: a tool, not a verdict on quality

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The standard

A measured oxygen ingress aligns the choice of closure with the intended ageing period. What counts is permeability over time, not the material.

Criteria

Permeability is quantified, not imputed to the material
The spread within a batch counts as much as its mean
The intended ageing period is fixed before the closure is chosen
Fault risk and ageing course are judged separately

Distinction

Closure ≠ ageing potential: the closure alters the course of an ageing, it does not establish it. Closure ≠ cork taint: a fault is a single event, a measured oxygen ingress a standing quantity.