It is common and well known that Overglaze Wucai Chinese antique porcelains exist, such in Ming Wanli , Jiajing, and Qing Kangxi period. It is relatively rare for Underglaze Wucai porcelain such as in Yuan or Ming Xuande period. We found that a third type of Wucai which is neither Overglaze, nor Underglaze that exists. We can call it In-Glaze Wucai for now.
Song Underglaze Inglaze Qinghua Wucai Story Double Gourd Vase 宋釉下青花五彩故事瓶
Ungerglaze cobalt (black), Overglaze yellow, blue, red, and brown?