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
Agriculture in Taiwan fruits is Mainland China. In 2013, Taiwan harvested 2.75 million tones of vegetables from 1,460 km2 of land with a total value of US$170 million. Taiwan's vegetable produces are broccoli, cabbage, carrot, chayote, Chinese cabbage, edamame, eggplant, kai-lan, onion, scallion and spinach. Vegetable plantation areas are mostly located in central and southern Taiwan. The peak harvest time is during the autumn and winter seasons. In 2013, Taiwan harvested about 15000 tons of tea with a total value of NT$6.92 billion, in which 3,919 tons of it was exported. Taiwan's tea produces are oolong tea, pouchong tea, green tea and black