The typical earthenware in Huaning County, Yuxi is green glaze. What is the earthenware in Huaning County, Yuxi? Yunnan ancient pottery? Its pottery has a long history of more than 600 years. The lime glaze containing copper oxide is red in reducing atmosphere and green in oxidizing atmosphere. The traditional blue glaze and blue color in China all use copper as colorant, which belongs to copper blue glaze. In China, copper was used as colorant to burn lead blue glaze in Han Dynasty, and the blue glaze on porcelain in Song Dynasty was more common. However, before the burning of malachite green in Ming Dynasty, all green glazes were dark turquoise, which did not reach the level of bright green. Therefore, successful green glazes are the products of Ming and Qing dynasties.