Longjing tea from bluish to deep green after steeping. Before infusion, higher quality Longjing teas have a very tight, flat shape and light green color. A study by Wang and Ruan (2009) found that one aspect of the perceived low quality of Longjing teas was a higher concentration of chlorophyll, producing a darker green color. The study revealed that free amino acids and theanine concentrations contribute positively to what is perceived as a good taste. Longjing tea was granted the status of Gong Cha, or imperial tea, in the Qing dynasty by the Kangxi Emperor. According to the legend, The Kangxi Emperor's
Longjing District rail through TRA Longjing Station. Longjing District Longjing District () is a coastal suburban district in western Taichung, Taiwan. Longjing shares borders with Wuqi and Shalu to the north, Xitun to the east, the Pacific to the west, Dadu and Shengang in Changhua County to the south. The eastern part of Longjing is located on the Dadu Plateau. The area was originally occupied by the aboriginal Papora people. The term "Longjing" (龍井) means "Dragon Well"; a well is located in the area. Prior to Japanese rule, the district was called "Chie Tou Village" (茄投庄). During Japanese rule over Taiwan the