What is sand powder?

It's not sand powder, it's Jiang Sha powder.

Ginger powder is dried ginger and ground into powder, which tastes stronger than ordinary Chili powder.

Its function is to induce the fragrance of food and increase the umami flavor. It can be made into boiled Jiang Sha chicken and roasted Jiang Sha pork.

Ginger powder has anthelmintic effect.

When the bed board is wet, it will produce lice, which will bite people, and the body will itch with red spots. Buy a few Liang of Alpinia officinarum powder from supermarkets or pharmacies, and put a few small bags in the four corners of the bed to repel insects.