Fermentation
After cutting, tea is subjected to a so-called "fermentation." This process is not actually a fermentation, which is an anaerobic process, but rather an enzymatic oxidization of the polyphenols in the tea leaves, yielding theaflavins and thearubigins. When the tea leaves are dry, fermentation stops, allowing some control of the process by manipulation of the drying rate or adding water after drying. Fermentation can also be interrupted by heat, for example by steaming or dry-panning the tea leaves through a technique known as "shāqīng" (殺青) In 17th century China numerous advances were made in tea production. In the southern part of China, tea leaves were sun dried and then half fermented, producing Oolong or "black dragon tea." However, this method was not common in the rest of China. Tea was used for medical purposes, and salt was often added to alter its bitter taste.
Read more about this topic: History Of Tea In China
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