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 as Bangkok, Chiang Mai, Phuket, Chumphon, Ratchaburi, Chon Buri, Hat Yai and Nakhon Sawan, with Chinatowns in these cities still featuring signage in both Chinese and Thai. As of the 2000s, only a little over 2% (200,000) of Thai Chinese still speak a variant of Chinese at home. A little over half speak Teochew, the largest variant group, followed by Hakka, Hokkien, Hainanese, Cantonese and Shanghainese. In commerce, Teochew, Cantonese and Thai are used as common languages and Chinese-language schools often use Cantonese as the medium of instruction due to its "lingua franca" status among most ethnic Chinese in Southeast