1）The primary components of black tea are polyphenols, which are a group of compounds that contain phenolic groups. Theaflavins are responsible for the reddish-brown color of black tea and contribute to its astringency and bitterness.
2) polyphenols, black tea also contains caffeine, which is responsible for its stimulating effects. Caffeine is a stimulant that increases alertness and energy levels. It also contributes to the flavor of black tea, as it has a bitter taste.
3）Black tea also contains essential oils, which are responsible for its aroma. These essential oils are composed of volatile compounds, such as terpenes, which are responsible for the floral and citrusy notes in black tea.
4）black tea contains amino acids, which contribute to its flavor. Amino acids are responsible for the sweet and savory notes in black tea.
