Also called formic acid, YiSuan. Ants secretion and bees fluid containing YiSuan, when people distillation ants YiSuan system, hence the name. Formic acid and a stimulating odour is colorless and corrosive, humans after skin contact will blister redness and swelling. Melting point, boiling point 8.4 one. Due to the special structure of formic acid, its a hydrogen atoms and carboxyl directly connected. Can also be seen as a hydroxyl formaldehyde. Therefore formic acid has simultaneously acid and aldehydes and properties. In the chemical industry, formic acid was used in rubber, medicine, dyestuff, leather kinds industries.