What Is The Wine Fermentation Tanks?

Wine is fermented in oak barrels, during the process of fermentation, wine will draw some tannin from oak. In chemical structure, dipped from grape skin tannins as "condensed tannins" draw tannins from the oak barrels as "hydrolysable tannins" is the soul of red wine tannins, its main functions: set up for wine "skeleton", stable body structure, a solid full; effective polymerization stable pigments, give the wine a perfect and vibrant colors.