茶的种类

Tea can be divided into five basic categories: black, green, oolong, white and puerh.

Black tea is allowed to wither, which precedes a process called oxidation (sometimes incorrectly referred to as fermentation) during which water evaporates out of the leaf and the leaf absorbs more oxygen from the air. Black teas usually undergo full oxidation, and the results are the characteristic dark brown and black leaf, the typically more robust and pronounced flavors of black teas, and, when brewed appropriately, a higher caffeine content compared to other teas (50-65% of coffee, depending on the type and brewing technique).

Green tea is allowed to wither only slightly after being picked. Then the oxidation process is stopped very quickly by firing (rapidly heating) the leaves. Therefore, when brewed at lower temperatures and for less time, green teas tend to have less caffeine (10-30% of coffee). Greens also tend to produce more subtle flavors with many undertones and