Food desiccant is a non-toxic, tasteless, non-corrosive and pollution-free substance. The function of food desiccant is to reduce the humidity in food bags and prevent food from spoilage. Commonly used food desiccants include calcium oxide, silica gel, montmorillonite desiccants, calcium chloride desiccants, and fiber desiccants, all of which will react with water. Of course, the iron powder desiccant itself is black. During use, try to avoid contact with desiccant and avoid eating it.