Black tea, also known as Crimson Tea because of the reddish color of its infusion, is more oxidized, stronger in flavor, and contains more caffeine than the other tea varieties. The crafting of black tea involves the withering of the leaves until the moisture content reaches below 60%, at which point they are rolled to help in the release of organic compounds which add to its distinct flavor. Black tea generally has a bold taste, and it will give you a more even and prolonged energy boost than the edgy rush that coffee drinkers are used to.