Formaldehyde(HCHO)
Formaldehyde is an organic chemical substance, the chemical formula is HCHO or CH₂O. Colorless, with a pungent odor, it has a stimulating effect on the eyes, nose, etc. Easy to dissolve in water and ethanol. The concentration of aqueous solution can reach up to 55%, usually 35% -40%, and typically 37%. It is called formaldehyde water, commonly known as formalin.