The biggest feature of wooden wine barrel is that wood has the advantages of stabilizing and increasing wine color, which makes the wine color look bright. Generally, the color of wine treated with oak is pleasant. Loading red wine is to better absorb the aroma of the barrel, and the barrel has very good air permeability, which can give red wine enough oxygen.
The barrel is used as a container for wine fermentation or ripening, rather than a container for wine. In other words, the function of the barrel is to add aroma and taste to the wine, rather than use it as a wine bottle, let alone pour back the leftover wine.