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 (龍井), taken from the name of a famous well in the area named Dragon Eye Well (龍目井) Dragon Eye Well is located in Longquan Village, under an old camphor tree. One of the Qing governors of Changhua recorded that the well's water was cool and refreshing, and the atmosphere was serene around the well. The name "Dragon Eye" comes from the two rocks around the well that makes it look like a dragon. Longjing houses Taichung Power Plant, the world's largest coal-fired power plant. The district is served by a variety of national roads. The district can be reached by