1. Collecting wine residue

The most practical role of the wine bottle groove is to accumulate the sediment inside the wine. In the early days of wine making, the technology was relatively backward, and after the wine was made, there would be dregs and peels left over from the filtration. Therefore, the bottom of the bottle notch allows the sediment and tannin crystals to settle at the bottom of the wine bottle, in order to reduce the impurities within the premium wine liquid.

These sediments are not harmful, but they can affect the taste of the wine to a greater or lesser extent if it is consumed. Generally speaking, the longer the wine needs to be stored, the deeper the concavity.

2. Maintaining structural stability

This concave part of the bottom of the bottle is called the "punt," a tradition passed down from the workers who used to blow up wine bottles. Although most modern wine bottles are made using models, a strictly flat bottom is still difficult to achieve in the production process, and it is easy to appear small bumps or depressions, or when there are small debris on the table, it will also lead to unstable, if the bottom of the bottle is designed as a groove to avoid this problem.

3, so that the wine cooled faster

The bottom of the bottle with grooves in the wine bottle has a larger surface area, so the cooling of ice with the contact area is also increased, the wine cooling speed will be faster. This is most noticeable in white and rosé wines.

Expanded:

I. Shelf life

Red wine is not as good as the older the vintage. The vintage on top of the red wine refers to the year the grapes were used to make it. Most (99%) of wines do not have the ability to age, and the optimal drinking period varies from wine to wine, generally between 2 - 10 years. Only a small percentage of exceptionally good wines have the ability to age.

Some of France's top Italian red wines can age for decades or even hundreds of years. Many wines from the top Bordeaux chateaux are still fit to drink even if they have been kept for more than a century. Wine suitable for aging needs tannin (i.e. tannic acid), and Cabernet Sauvignon (grape variety) is the most suitable for aging among many grape varieties due to geographical factors and its characteristics.

II. Optimum temperature

The optimum temperature for storing wine is usually 10°C. Generally speaking, temperatures between 7 and 18°C are not harmful. It is important to avoid temperature fluctuations in the cellar: unstable temperatures will have an impact on the quality of the wine. Try to avoid storing wines above 20°C for long periods of time, and not below 0°C, as this will cause the wine to stone and precipitate, therefore reducing the acidity of the wine.

Baidu Encyclopedia - Red Wine

Phoenix - Bottom of the wine bottle, why the groove?