Introduction to century-old wine barrels: Oak wine storage has a long history and has a history of nearly a thousand years. During the aging of wine in oak barrels, tannins, vanillin, oak lactones, eugenol and other compound substances in the barrel will dissolve in the wine. These substances can make the color of the wine more stable and the taste softer. , the fragrance is more harmonious. In addition, the permeability of oak barrel walls improves the clarity of wine.