1. Put the glass in front of the white background. When the light source is sufficient, tilt the glass slightly outward and observe whether there are sawdust or impurities in the red wine through the body. Good red wine is clear.

2. If the color of wine is purplish red, it means that the year of wine is close, and the color of red wine will gradually fade with time. When you are young, it will gradually turn red or cherry red, then red, orange or brick red, and finally turn red and brown. Red-brown wine is an ancient good wine.

3. Good red wine smells mellow. In the life cycle of wine, the aroma presented in different periods is also different. The initial aroma is the aroma of the wine itself, the second comes from the aroma produced in the brewing process, such as woody and tobacco, and the third is the aroma produced after maturity. On the whole, its aroma is related to grape varieties, brewing methods, wine age and even soil.