Black tea will be oxidized after being soaked for a long time, the tea color will turn brown and black, and the taste will be greatly reduced, and nitrosamines will be produced, which is not good for health. Even if tea leaves are used to make tea, they will be poured out every time, and the tea leaves need not be soaked, and water will be added when drinking again, so that the tea tastes good.

Lipton black tea is made into tea bags by chopping the original piece of black tea. The chopped black tea is released very quickly in water, and all the essence in the tea leaves is released in 2-3 minutes. It is meaningless to put the tea bag in it all the time.

If the tea bag is not taken out in the cup, other elements in the tea will be released, which will lead to bitter taste of tea and affect the taste.

Black tea is sweet and warm, which can nourish human yang; Black tea is rich in protein and sugar, which warms the abdomen by heating, enhances the cold resistance of human body, and also helps digestion and greasy. Black tea is also called fully fermented tea because it is fully fermented during processing, which oxidizes tea tannins. Fresh tea leaves are oxidized to form red oxidative polymerization products-theaflavin, thearubigins and theabrownin. Some of these pigments are dissolved in water and brewed to form red tea soup.