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
Language and overseas Chinese communities Mandarin are well preserved in Upper Burma. Ethnic Chinese in Vietnam are categorized into three groups that are based on migrant history, location and level of integration. The largest group is the Hoa, numbering almost a million individuals and have historically been influential in Vietnamese society and economy. They are largely concentrated in major cities of the former South Vietnam (especially in Ho Chi Minh City) and largely speak Cantonese, with Teochew being found among a significant minority. The two smaller Chinese-speaking groups consist of the San Diu and Ngái. The San Diu number over 100,000 and are concentrated in