A craftsman colors porcelain bowls at the first Changzhi Agricultural Cooperation and Development Expo Week in Changzhi city, Shanxi province, Sept 23. Red and green- porcelain is one of the earliest forms of colored porcelain originating from the Song (960-1279) and Jin (1115-1234) dynasties. Based on the biscuit firing, the glazed porcelain is colored with red and green glaze and then sent for a second glaze-firing. [Photo/news.cn]