Tea is a beverage rich in nutrients. When using boiling water to make tea in a pot or ordinary cup, a large number of beneficial ingredients are dissolved in the water to make the tea soup produce an aromatic odor. At the same time, the tea polyphenols and tannins are blended into the water to make the tea soup slightly refreshing. The bitterness can be said to be just right. The use of a thermos cup to make tea, because the temperature has been kept high, so that the aromatic substances are quickly volatilized, thereby reducing the fragrance that should be. In addition, the high temperature can also cause excessive secretion of tea polyphenols, making the tea soup rich in color, bitter and astringent, and has a dull taste. In addition, because vitamins are not resistant to high temperatures, soaking in high temperature for a long time causes greater loss. Therefore, it is not advisable to use a thermos cup to make tea.
