It is said that the Emperor himself supervised the casting at the many large furnaces at the back of the palace. The coins are assigned amuletic properties and "magical powers" because they were made from Buddhist statues, and are said to particularly effective in midwifery – hence the many later-made imitations which are considered to be a form of Chinese charms and amulets.
The Emperor personally oversaw the casting of coins at large furnaces within the palace's rear. The coins were attributed with amuletic properties and "magical powers" due to their Buddhist statue origins, and are believed to be particularly effective in childbirth, leading to imitations that are considered Chinese charms and amulets.