Nitric Oxide is a colorless to reddish brown gas with suffocating odor. Poison gas. Corrosive. Oxidizer. Nitric Oxide is severely irritating to eyes and respiratory system. It is harmful if inhaled, respiratory tract irritation, skin irritation, blood damage. Containers may rupture or explode if exposed to heat. May ignite combustibles. May react on contact with water. May react on contact with air. Releases toxic, corrosive, flammable or explosive gases.