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
Camellia oil is a sweet seasoning and cooking oil made by pressing the seeds of "C. oleifera", "C. japonica", and to a lesser extent other species such as "C. crapnelliana", "C. reticulata", "C. sasanqua" and "C. sinensis". Relatively little-known outside East Asia, it is the most important cooking oil for hundreds of millions of people, particularly in southern China. Camellia oil is commonly used to clean and protect the blades of cutting instruments. Camellia oil pressed from seeds of "C. japonica", also called tsubaki oil or tsubaki-abura (椿油) in Japanese, has been traditionally used in Japan for hair care. The camellia