1. black tea (fermentation degree: 70%-90%)- completely fermented tea.

Black tea is the most sold tea in the world, which belongs to fully fermented tea.

2. Black tea (degree of fermentation: changing with time)-post-fermented tea.

The fermentation of black tea is the most special. Other teas are fermented only by their own substances, and the fermentation of black tea also depends on the power of external microorganisms, so the fermentation is very thorough.