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Why is there an indentation at the bottom of a wine bottle?


The indentation at the bottom of a wine bottle is called a punt.

Historically, punts were a function of wine bottles being made by glassblowers. The seam was pushed up to make sure the bottle could stand upright and there wasn’t a sharp point of glass on the bottom. It’s also thought that the punt added to the bottle’s structural integrity.

Bottles nowadays are much stronger and machine-made, so the punt is simply part of wine-bottle tradition, though some say it helps collect the sediment as wines age.

Punts no longer serve a structural function except in bottles of sparkling wine, which have constant pressure inside. In these cases, the punt allows for more even distribution of pressure.

The size of the punt doesn’t mean anything about the quality of the wine inside.

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