Decaffeination this trait could be bred into other coffee plants by crossing them with "C. charrieriana", or an equivalent effect could be achieved by knocking out the gene for caffeine synthase in normal coffee plants. Tea may also be decaffeinated, usually by using processes analogous to the direct method or the CO process, as described above. The process of oxidizing tea leaves to create black tea ("red" in Chinese tea culture) or oolong tea leaves from green leaves does not affect the amount of caffeine in the tea, though tea-plant subspecies (i.e., "Camellia sinensis sinensis" vs. "Camellia sinensis assamica") may differ
Chinese tea culture or "cha wenhua" ("tea culture"). The word "cha" (茶) denotes the beverage that is derived from "Camellia sinensis", the tea plant. Prior to the 8th century BCE, tea was known collectively under the term 荼 (pinyin: tú) along with a great number of other bitter plants. These two Chinese characters are identical, with the exception of an additional horizontal stroke in the Chinese lettering 荼, which translates to tea. The older character is made up of the radical 艸 (pinyin: cǎo) in its reduced form of 艹 and the character 余(pinyin: yú), which gives the phonetic cue. There are several