Moon cake wrapping paper ink should be food grade. Food-grade ink refers to the ink for food contact materials and products that meets the national standard GB4806. 1. This standard stipulates the basic requirements of ink for food contact materials and products, including heavy metals, plasticizers, solvent residues, microorganisms and other requirements. Therefore, the ink of mooncake wrapping paper should be food grade. Moon cakes, also known as moon cakes, harvest cakes and reunion cakes, are one of the traditional delicacies of Han nationality in China. Moon cakes were originally used as offerings to worship the moon god. Eating moon cakes and enjoying the moon in Mid-Autumn Festival is an indispensable custom in northern and southern China. Moon cakes symbolize a happy reunion. They are regarded as holiday food, used to offer sacrifices to the moon and give gifts to relatives and friends.