White tea is essentially unprocessed tea. If you look closely at the leaf you'll see white fuzzy along with the freshly opened bud. The producer will pick the newest growth on the tea bush and be careful to not bruise the plant in any way. Then it's allowed to "solar wither," which is simply set in the sun and allowed to dry a bit. Some minimal natural oxidation can happen, maybe 5-10% because it can take a day or two to air dry these tea leaves. When brewed, white teas produce a pale green or yellow liquid and have the most delicate flavor and aroma. Silver Needle is famous Chinese white tea.