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
Korean tea as ancestral rites often involved offerings of tea to the ancestors. Wedding ceremonies also included tea offerings. The practice of packing tea into small cakes, which lost popularity in China during the 14th century, continued in Korea until the 19th century. In 1895, King Gojong of the Korean Empire used coffee for the first time. In 1896, grocery stores began to have tea rooms as annexes, and the first modern tea house was established in 1924. Although tea from the "Camellia sinensis" plant is not as popular as coffee in South Korea - with the annual South Korean tea consumption