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
Chinese cuisine all social classes. Tea processing began after the Qin and Han Dynasties. The different types of Chinese tea include black, white, green, yellow, oolong, and dark tea. Chinese tea is often classified into several different categories according to the species of plant from which it is sourced, the region in which it is grown, and the method of production used. Some of these types are green tea, oolong tea, black tea, scented tea, white tea, and compressed tea. There are four major tea plantation regions: Jiangbei, Jiangnan, Huanan and the southwestern region. Well known types of green tea include Longjing,