The raw materials for fans are actually quite simple. Potato vermicelli is originally potato flour and water. The raw material of sweet potato vermicelli is sweet potato powder. The drying method determines the dryness and humidity of the final product. If it is too dry, it will break easily. Personally, it doesn't matter much about health care, because the raw materials of vermicelli are very single. . . . Do not dry in the sun for the toughness of the finished product, and do not break it.