Longjing tea or by steaming the leaves before they completely dry out. As is the case with other green teas (and white teas), Longjing tea leaves experience minimal oxidation. When steeped, the tea produces a yellow-green color. The tea contains vitamin C, amino acids, and, like most finer Chinese green teas, has one of the highest concentrations of catechins among teas. For best infusion results, water at around 70-75 °C or 167-176 °F should be used to brew the tea leaves. Although it is common practice nowadays to steep Longjing tea in porcelain or glassware, it is claimed the real taste profile
Wuyi tea technique for stopping the oxidation process of tea, pan-firing the leaves in a dry wok rather than steaming them as had been done previously. Songluo-style green tea became popular, and the new production method spread to other regions. In the 16th century, Wuyi tea makers invited monks from Songluo to teach their techniques to them. Eventually they discovered that by allowing the tea to partially oxidize before firing, they could produce a darker, fragrant type of tea which came to be known as oolong ("wulong", "black dragon") tea. European merchants began purchasing tea in Canton (Guangzhou) during the 17th century.