Anhua black tea, belonging to post fermented tea, is a specialty of Anhua County, Yiyang City, Hunan Province, and also a national geographical indication product of China. Black tea has a pure aroma, a mellow and sweet taste, and has the effects of clearing heat, digestion, detoxification, and prolonging life. In addition, black tea contains rich minerals, vitamin E, etc., which have the effect of promoting cell regeneration and delaying aging