1 has different functions: black tea can refresh the mind, and green tea can protect teeth and improve eyesight.

2. Different production methods: The difference between black tea and green tea can best be reflected in the production method. Black tea is completely fermented, while green tea is not fermented in the production process, but is made by enzyme fixation, rolling and drying, so their production methods are different.

3. The difference of brewing color: the tea soup brewed by black tea is light brown to brown, and the tea soup brewed by green tea is green to dark green.

4. Water temperature difference during brewing: black tea is brewed with boiling water of 90-100 degrees, so that the effective components are separated out and the tea taste will be stronger; If it is green tea with tender leaves, the water temperature should be about 80 degrees, so as not to destroy vitamin C and make the tea bitter.

Refer to the above? Baidu encyclopedia-black tea