Green tea leaves plucked in the morning are ready to be brewed in a pot the same night. The bypass of oxidation allows green tea to retain most of its natural dark green color, tannins, vitamin C, chlorophyll and minerals. The taste of green tea is therefore more astringent and subtler than oolong or black tea.
The lack of oxidation is also responsible for the very low caffeine content of green tea (only 1%). Its caffeine effect produces a nearly steady, mild high with no big peaks or plunges. Green tea is therefore the perfect meditative aid: it acts as a mild stimulant, without causing insomnia or nervousness. It refreshes and quiets.
Preparation of green teas requires pure water at 175° F. (Boil, then cool 3 mins)
Chinese green teas contain about 30–35 milligrams of caffeine per 8 oz cup, and Japanese green teas contain 25–30 milligrams of caffeine per 8 oz cup.