Red wine is a fermented drink obtained from the fermentation of black grape must with maceration of film, glitch and sometimes the roundup. - The fell and scratched harvest is directed to the fermentation tanks. Alcoholic fermentation is triggered and lasts on average four to ten days. At the same time, the coloring materials and the tannic elements contained in the skin diffuse in the farm must. Depending on the type of red wine sought, maceration will be more or less prolonged and all the more delicate. Indeed, the red guard wines require longer maceration in order to obtain a good structure and an aptitude for aging. However, the concentration of tannins increases over time and too long maceration would cause unpleasant strong astringency. - We then proceed on the edge of the tanks in order to put an end to the maceration.