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Why do wine bottles have a notch at the bottom, and does it serve any purpose?

“Punt” or “kick-up” In fact, before the industrial revolution, glass bottles needed to be “blown” by experienced craftsmen one by one. It’s a bit like the concept of blowing a balloon. A hot glass source is attached to one end of the long tube. While rotating, the master blows air from the other end to blow out the glass bottle. The bottom of the glass bottle blown out in this way will be curved (can you imagine that the balloon blown out has rhombuses and corners?). The bottle cannot stand directly on the table. At that time, the easiest way was to lift the bottom of the bottle. Rub it inward slightly so that the bottom of the bottle contacts the tabletop in a circle rather than a round surface to solve the problem of the bottle standing. Therefore, the glass bottle with a notch was born, and this notch has a term called “punt” or “kick-up”. Later, with the development of science, everyone learned that in fact, the notch at the bottom of the bottle is better able to withstand high pressure, so sparkling wine bottles are suitable for such a design; some sommeliers think it is more elegant to dig their thumbs into it to grab the bottle when pouring wine, or In this way, the temperature of the palm will not interfere with the temperature of the wine; or in this way, the tartaric acid precipitation in old wine will be more concentrated; some wine merchants say that this will cause the illusion of a larger volume in each bottle… In short, there are many opinions, and they all seem to have a little truth. But none of them seem to be trivial problems that modern technology cannot solve. But in this subculture that advocates ancient laws, culture, and history, the visual impact that contrasts with modern technology, and the history behind it, perhaps such a little ingenious design has its added value.