Where does alcohol come from in wine.
Grapes do not contain alcohol. Alcohol is formed after fermentation of grapes. A bunch of grapes contains a lot of sugar. And grapes, which are in the process of fermentation, sugar turns into alcohol.
Therefore, the more sugar is found in grapes and in its juice, the higher the level of alcohol.
If the grapes were harvested in full maturity, the grapes contain more sugar, and then alcohol reaches 13-14%. There is also evidence that when the glass rotates, the crown remains on the walls of the glass or how the word “socks” is used. It consists of glycerin. And glycerin is an indicator that wine contains a lot of alcohol.
You do not need to be an excellent specialist to find out if the wine contains a lot of alcohol or not. Often we follow the label on the bottle, where alcohol must be indicated. Or if this is ordinary homemade wine, and to find out if it contains alcohol, it is enough to raise it to turn the glass to see the mark on the walls of the glass.
At home, during the fermentation process, of course, sugar and several buckets of water are added. Thus get a stronger wine with a higher alcohol content
But in quality wines, if there is not enough sugar in the grapes, the residual sugar obtained from the grapes is added.