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Decorative covering of the neck of the bottle. Formerly made of wax, it participated in the sealing of the bottle. The crimped lead gradually replaced the wax. Now prohibited for health and environmental reasons, lead is now replaced by various crimped materials (tin, pressed aluminium, plastic/aluminium complex) or heat-shrunk (plastic). In France, the capsule is also used to control the circulation of wine: see capsule representative of the duties (CRD).