<unk>  burns, not evident until a day after<unk>  is one of the toxic gases produced naturally by volcanic eruptions. Upon contact with moisture, including tissue,<unk>  immediately converts to hydrofluoric acid, which is highly corrosive and toxic. Exposure requires immediate medical attention. It can cause blindness by rapid destruction of the corneas. Breathing in<unk>  at high levels or in combination with skin contact can cause death from an irregular heartbeat or from fluid buildup in the lungs.
Hydrogen fluoride
Vinyl chloride
Triphenylchloroethylene
Tetrachlorodecaoxide
Triphenylbromoethylene
Hydrogen selenide
Heptachlor
Bromine monochloride