Jun Kiln was a famous porcelain kiln in the Northern Song and Jing dynasties, it was located at Yuxian county in Henan province and started to produce porcelain in the Northern Song dynasty, lasted to the Jing and Yuan dynasties. It used iron and copper to produce varied colors of glaze, such as red in blue, purple spot, pure sky blue, pure moon white. These achievements changed the situation of only a few glaze colors like high temperature blue glaze, black glaze, and white glaze, greatlyenriched the color tone and aesthetic feeling of porcelain, which became the foun-
dation on big progress on fresh red glaze in Jingdezheng kiln of the Ming and Oing dynasties. In the Northern Song dynasty, it mainly produced floral pot, brush washer and zun, but it changed to produce plate, burner, kettle, jar, brush washer in the Jing and Yuan dynasties, the number of big size wares was more than that of the Song dynasty. Comparing with the Song dynasty, porcelain of the Yuan and Jing dynas-
ties had the characters of soft shell, pinhole on glaze, lustre was not so good, glaze was blue sky mixed with moon white, but mainly was moon white, usually glaze was not applied on bottom of the wares.