When did Baobao blue glaze become popular?

Precious blue glaze is a traditional Chinese glaze vessel color that dates back to the Tang Dynasty (618-907). During the Song Dynasty (960-1279) and the Ming Dynasty (1368-1644), the production of Perspex blue glaze reached its peak and was widely used in architectural decorations, furniture, and artifacts for palaces and temples. With the passage of time, the use of precious blue glaze gradually decreased, but it is still preserved in some traditional crafts.