Can you drink tea leaves that turn yellow and dark? Why do tea leaves turn yellow after a long time? Why does the tea color darken and the soup color change after the tea leaves are left for a long time.

Just saw a tea friend very interesting question, that is, the tea leaves that have been placed at home for two years, the tea color is a little yellow and dark, not very green, when brewed, the soup color is also very yellow, and the aroma of the tea leaves is gone. Then two questions were asked, why does the tea turn yellow and dark after a long time? Also, can you still drink discolored tea?

Why do tea leaves turn yellow after a long time? Some people say that it is the oxidation of the tea leaves. Some people say no, my black tea has not turned yellow for two years, and some people say that my Pu'er tea has not turned yellow either. Some people say you can drink it. Some people say that such tea leaves cannot be drunk and can be used to soak feet or be used as flower fertilizer.

First, let's answer why tea leaves turn yellow and dark.

Tea contains a variety of chemicals, the most important of which is tea polyphenols. Tea polyphenols have antioxidant properties, and when the tea leaves are fresh, they are able to react with oxygen in the air to form oxides, causing the color of the tea to darken, producing oxidative flavors and reducing the nutritional value of the tea leaves.

It may also change due to environmental factors such as air, humidity, and temperature. Some tea leaves may turn yellow due to oxidation or exposure to ultraviolet rays. In addition, the chlorophyll in tea changes over time, causing the tea to turn yellow.

Second, whether the yellow and dark tea can be drunk, this mainly depends on the specific tea, there is still time and preservation environment. Many people say that tea leaves turn yellow can not be drunk, mainly refers to green tea, yellow tea two major types of tea. In terms of taste, many people drink tea and drink the fragrance of tea. If the fresh aroma of tea is gone, drinking tea will lose its pleasure, and it will be reduced in terms of nutrients and appearance. Therefore, basically tea that has turned yellow for more than a year is not recommended to drink. But many people say that as long as there is no mold, such tea can still be drunk, and they are reluctant to throw it away.

But if it is white tea and Pu'er tea raw tea, due to the process, when the tea leaves are stored, the tea color will slowly turn yellow and darken and turn brown. The color of the soup also slowly turns golden. This is the process of slow oxidation and self-fermentation of white tea and raw tea, which is a sign that the quality of tea leaves has become better and the taste has become better.

There are also things like black tea and black tea (ripe tea), basically do not exist, saying that the color of the tea becomes dark and yellow.

Now is the time for new tea to go on the market, and many people also have the habit of buying more green tea before the new tea is on the market. However, please pay attention to the fact that good tea must have a good preservation method. Buy green tea back and seal it directly! Of course, it's new tea now, and the temperature hasn't been high lately. It can be left for a week or two and then frozen.