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 Staff and Workers' Association the industry is high. A United States Department of Labor study in 1997 found that 90 percent of the 3,000 garment manufacturing shops in New York City's Chinatown were sweatshops. About 70 percent of the shops are owned by ethnic Chinese. Most employers pay by the piece rather than the legally required minimum wage, and violations of wage and overtime standards are common. Injuries are frequent, and some of them crippling, but workplace safety laws are rarely enforced and few employers participate as required in the state workers' compensation system. Since 1981, the Chinese Staff and Workers' Association has sponsored