1. color observation: the color of aged wine will turn yellow slightly. The darker the color, the longer the wine age. The color of the new wine is transparent;

2. Smell: The longer the wine is stored, the weaker the excitement of the wine. Old wine is not pungent, but it smells pure. The new wine is pungent;

3. Taste: Old wine is soft but not spicy, soft and strong, and thick in the tongue, without the discomfort of spicy tongue.