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
Tianchi basin Tianchi basin As precipitation was for important agriculture and food production, the Song Chinese mathematician and inventor Qin Jiushao developed a precipitation gauge that was widely used in 1247 during the Southern Song dynasty to gather meteorological data. Qin Jiushao later records application of rainfall measurements in the mathematical treatise "Mathematical Treatise in Nine Sections". The book also discusses problems using large snow gauges made from bamboo situated in mountain passes and uplands which are speculated to be first referenced to snow measurement. Tianchi basins were installed at provincial and district capitals and bamboo snow gauges were situated in mountain