Why is the bottom of red wine bottle concave and what is its function?

The bottom of wine bottles is generally concave, because after wine is stored, more or less some sediments will appear, including pigments, tannins, tartar crystals and so on. The bottom of the bottle is concave to prevent the sediment from pouring out too much. Of course, there are other benefits, that is, the bottle should not be fragile, but strong. Don't worry, it's all natural ingredients of wine, and it's also an inevitable phenomenon in the process of wine aging, especially those wines that are not sticky (using natural colloidal substances such as egg white to promote wine clarification) and unfiltered are more likely to precipitate. In foreign countries, especially in Europe, it is usually not a problem because consumers are well aware of this phenomenon. In China, it is different, because the extensive consumption history of wine is very short, and many problems about wine have not been widely promoted. Therefore, there is a saying in the national product standard of wine: "Red wine packaged for more than 18 months is allowed to have a small amount of precipitation."

Although it will not affect our health, no one wants to drink these sediments into his mouth. Therefore, when there is sediment in the bottle, it is necessary to "decant the wine" before drinking. One goal when pouring wine is to separate the sediment as fully as possible, and the less wine is wasted, the better-after all, a small amount of wine is mixed with sediment and discarded (whether it is discarded or not depends on yourself). In fact, the main function of this concave hole is to collect the sediment at the bottom of the groove when the wine is upright, so that the sediment can be removed from the groove when the bottle body gradually becomes 90 degrees when changing bottles. The more wine needs to be stored for a long time, the deeper the concave and convex. So generally speaking, good wine needs to be preserved for a long time, and the bottom of the bottle is concave and convex, but the wine with deep concave and convex bottom is not necessarily good wine.