I have bought color-changing silica gel 500 grams of 10 yuan
I have the impression that most of the foodstuffs are lime desiccant
There are roughly four kinds of food desiccant on the market:
One kind of transparent silica gel is non-toxic, and it does not need to be done after accidental ingestion;
Another kind is ferric oxide, coffee-colored, with a slight irritation;
There are also two kinds of white powder, one is calcium chloride, only a slight irritation; the other is calcium oxide, which is often referred to as quicklime, is white or off-white lumps, with strong absorption of moisture in the air, because calcium oxide meets water to become calcium hydroxide in the process of releasing heat, so it will burn people's eyes , mouth or esophagus. At the same time, calcium hydroxide is alkaline and has corrosive effect on oropharynx and esophagus; if it splashes into the eyes, it will also cause damage to conjunctiva and cornea. However, due to the relatively low cost of lime desiccant, but the moisture absorption rate can reach about 30%, and can always have good moisture absorption performance, so by the seaweed, rice crackers, candies, dried fish and other dryness requirements of children's food packaging is widely used