Look at the color-the color of old wine will turn yellow slightly, just like old newspapers. The darker the yellow, the longer the wine age, and the thicker and brighter the wine color. The new wine is white, transparent and colorless.

Smell-the longer the wine is stored, the weaker the excitement (the less it will flush the nose). The smell of old wine is not pungent at all, but pure and quiet (such as still water flowing deeply). The quieter the wine, the longer the wine age, while the new wine will flush the nose, stimulate the nose and make the smell unpleasant.

Taste-Old wine is soft but not spicy, cold, clean, soft, full of wine aroma and strong tongue feeling. The spicy tongue without wine is unpleasant (such as cold oil passing through the tongue), and the degree varies with the age of the wine, and it is peaceful, pleasant and euphoric after drinking.

After drinking-there are many substances with low boiling point in new wine, which is easy to make the wine top. With the change of time, these substances will decrease, so the older the wine, the less it will reach the top (of course, this is for wines with good wine quality. If the quality of wine is poor, it will not be a good wine, and it is easy to go online. )

From the sensory point of view: take a bottle of old wine and shake it vigorously. The old wine with rich foam and long residence time is high-quality wine, and the old wine with little foam and short disappearance time is inferior wine. Pour a small amount of old wine into the glass, gently shake the glass, and observe the speed of the wine flowing down the glass wall. High-quality old wine is made of rhubarb rice, so it has high viscosity and long cup hanging time, while inferior old wine is made of alcohol and pigment, so it has low viscosity and short cup hanging time.

Try to feel it: pour a small amount of old wine into your hand, and the high-quality old wine has a very strong satiny feeling, which is very sticky after drying; The tentacles of inferior old wine only feel like water, but they don't feel sticky when they are dry.

Concentration measurement: measure the concentration of old wine with measuring cylinder and concentration meter. High-quality old wine generally has a high concentration because it contains sugar, various amino acids and trace elements, while inferior old wine is generally prepared with alcohol and pigment.