It between in green tea and black tea,belong to semi-fermented tea.Named after the bodhisattva Avalokitesvara (known in Chinese as Guan Yin), it has also been translated as "Iron Goddess of Mercy" (more correctly, "Compassion") after the old translation for Guan Yin's name. it has good efect to some difficult disease except the basis healthy funtions of tea ,it can be as the subsidiary product to diabetic ,lose weight ,beauty ,protect dental decay ,clearing heat and down fire ,anti-smoking and sober you up