This vessel was used for burying a placenta, a custom practiced by aristocratic families in Korea in the belief that it would bring happiness to the child. This jar was placed inside another wide-mouthed jar then buried inside an outer stone box. This rare jar has a bluish-green tone commonly seen in Buncheong ware. Pots were coated with a white slip, and then decorative designs were added using a combination of inlaid and stamped techniques. This style emerged in the 1400s, and then disappeared after the 1500s due to the popularity of white porcelains.