Mate, I wouldn't know this poisons , 'mode of action' , but its really dangerous, stuff. On the labels , with the flask, it tells you "highly poisonous, when in contact, with skin, by inhalation & by ingestion, etc" Only way to be reasonably safe when using it, is to have PPE on, & a full face, respirator, would be essential, if not vital,......years ago, I sought advice off a professional Pesty, & he told me he just opens the flask , at arms length out in the open air, with NO GEAR , on !! ?,...honestly,.....such POOR advice, & i would NOT RECOMMEND, under any circumstances