Thermos can't make tea. Will increase carcinogens.
Tea contains a lot of tannic acid, theophylline, tea oil and a variety of vitamins. It is more suitable to brew with water of about 80 °C. If you use a thermos cup to soak the tea in high temperature water for a long time, it will make the vitamins in the tea. When it was destroyed, the tea sesame oil volatilized a lot, and citrate and theophylline ooze a lot. This not only reduces the nutritional value of tea, reduces the aroma of tea, but also increases carcinogens.
In fact, the reason is very simple, because tea leaves soaked in high-temperature water for a long time, just like boiling on a hot fire, tea polyphenols, tannins and other substances will be leached in a large amount, making the tea color thick and bitter.
At the same time, the high water temperature will also make the aromatic oil in the tea evaporate quickly, reducing the fragrance of the tea. In addition, nutrients such as vitamin C are also destroyed when the water temperature exceeds 80 ° C, and the health value is greatly reduced.
Therefore, it is not advisable to use a thermos cup to make tea. If you want to drink hot tea, you can brew it with a teapot such as a teapot or a ceramic cup. After the tea is soaked, it can be poured into a thermos cup. If the quality of the tea soup is high, it should be ready to drink.