Pu-erh tea

„The leaves are then dry pan-fried using a large wok in a process called "kill green" (殺青; pinyin: shā qīng), which arrests most enzyme activity in the leaf and prevents full oxidation. After pan-frying, the leaves are rolled, rubbed, and shaped into strands through several steps to lightly bruise the tea and then left to dry in the sun.“

„When examining maocha, the colour of gu shu leaves tend to be more highly contrasted with a bright white hairy bud/tip surrounded by a grey, open leaf wrapper, with dark black stem & leaves. By comparison, tai di cha is almost all black, due to the use of fertilizer, the leaves grow quickly and the buds have less white hairs.“