"Masked paper" was loess paper and white linen paper in ancient times.
Archaeological discoveries in recent years show that people in the Qing Dynasty carved various patterns on paper and always covered the faces of the dead.
After the late Qing Dynasty and the early Republic of China, in addition to loess paper, white linen paper and ordinary yellow paper, the cover paper should be removed when buried.
Legend:
"Cover paper" is a paper separated by yin and yang. If you don't have to mask the yin and yang after death, the dead can't enter heaven, and even if you don't want to die, you may become a ghost.
Scientific research:
The dead have many different shapes and scary faces, so they cover their faces with yellow paper and gold for good luck.