Ogilvy, the scientific name of polyacrylamide hydrogel, is a colorless, transparent and colloidal liquid substance. Amide hydrogel is a chemical compound, and its monomer is highly toxic, while the compound is nontoxic, but it will decompose and produce highly toxic after being injected into human body. Because it can be decomposed into highly toxic monomer molecules in the human body, it can poison the nervous system, damage the kidneys and cause harm to the life circulation system. The World Health Organization has listed this substance as one of the suspected carcinogens, and it is a time bomb.