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
Taiwanese tea sought profit in developing an alternative tea product on the island. Pouchong oolong was considered to be more flowery than Baihao Oolong, Pouchong was exported under the name "Formosa Pouching". In fact, Dongding Oolong (), White Tip Oolong () and Baochong Oolong (), Alpine or High Mountain Oolong, are all categorized as Oolong tea, which contributes a large part of Taiwan tea industry. Oolong tea was practically synonymous with Taiwanese tea in the late 19th century, and competitors in Ceylon sought a US market advantage by publishing materials emphasizing the use of human foot trampling during its production. This was