Pu-erh tea

„This process was first developed in 1972 by Menghai Tea Factory and Kunming Tea Factory] to imitate the flavor and colour of aged raw pu-erh, and was an adaptation of wet storage techniques being used by merchants to falsify the age of their teas. Mass production of ripened pu'er began in 1975. It can be consumed without further aging, though it can also be stored to "air out" some of the less savoury flavors and aromas acquired during fermentation.“

„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.“