Black tea Black tea Black tea is a type of tea that is more oxidized than oolong, green, and white teas. Black tea is generally stronger in flavour than the less oxidized teas. All four types are made from leaves of the shrub (or small tree) "Camellia sinensis." Two principal varieties of the species are used – the small-leaved Chinese variety plant ("C. sinensis" var. "sinensis"), used for most other types of teas, and the large-leaved Assamese plant ("C. sinensis" var. "assamica"), which was traditionally mainly used for black tea, although in recent years some green and white teas have been produced.
Gleditsia sinensis Gleditsia sinensis Gleditsia sinensis is a species of flowering plant native to Asia. In China, "Gleditsia sinensis" is commonly known as "zào jiá" (). The English equivalents include Chinese honey locust (or Chinese honeylocust), soap bean and soap pod. It is one of the alleged "50 fundamental herbs" used in traditional Chinese medicine. "Gleditsia sinensis" has been used in China for at least 2000 years as a detergent. The thorns of "Gleditsia sinensis" are used as a medicinal herb in China and Korea and may have antitumor properties. The thorns of "Gleditsia sinensis" LAM. (Leguminosae) have been used in traditional