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
Heavenly Lake of Tianshan Heavenly Lake of Tianshan Tianchi () is an alpine lake in Xinjiang, Northwest China, situated at . The name (天池) literally means Heavenly Lake and can refer to several lakes in mainland China and Taiwan. This Tianchi lies on the north side of the Bogda Shan ("Mountain of God", "Bogda" is a Mongolian word meaning "God") range of the Tian Shan ("Mountain of Heaven"), about south of Fukang and east (straight-line distance) of Ürümqi. It is an alpine drift lake shaped in the Quaternary Glacier period. Formerly known as Yaochi ("Jade Lake"), it was named Tianchi in 1783 by Mingliang,