1, the general food desiccant is calcium oxide or silica gel, and calcium oxide is calcium oxide, which generates heat when it meets water. If a certain amount of calcium oxide is added to a closed cup, it will explode. The boy in the news is fiddling with a desiccant containing calcium oxide.

2. In addition, there is a common desiccant in food packaging, called silica gel desiccant, which will only react physically when it meets water and will not do much harm to human body. It is a desiccant approved by the European Union.