This cup is an early example of blown glass in China. The shape of this cup is probably based on foreign examples brought into China during the Han dynasty. Compare the green glass cup of similar shape and slightly smaller size (5.8 cm. diam.) unearthed in Gui Xian county, Guangxi province in 1957, illustrated by Fan Shimin and Zhou Baozhong, "Some Glass in the Museum of Chinese History", R.H. Brill and J.H. Martin (eds.), Scientific Research in Early Chinese Glass, The Corning Museum of Glass, 1991, p. 196, fig. 5, which the authors describe as a foreign import, as a chemical analysis showed that it did not contain lead, but is a potash-lime-silica glass.