Cyan, a greenish-blue color. The porcelain glazed with this color is called Celadon (青瓷 Qing Ci). However, this color also comes in a variety of beautiful shades that were used in porcelain throughout Chinese history.
This teacup is available in two colors, which are the famous shades of cyan that were loved by people in the Ming Dynasty and the Qing Dynasty. The dark blue is called Ji Lan You (霁蓝釉, lit. clear blue glaze) and the light green is called Dou Qing You (豆青釉, lit. bean-green glaze). 
The white glaze in the inner side of the teacup makes it easier to observe the liquor's color during a Gongfu tea session.
This teacup has a slightly smaller capacity than other teacups we carry - it can hold about 40ml water. When using this teacup with the matching Gaiwan, Cyan, one steep will be enough for 3-4 people to enjoy.