<unk>  is a chemical compound with the formula . In its pure form, it is a very pale blue liquid, slightly more viscous than water. It is used as an oxidizer, bleaching agent, and antiseptic, usually as a dilute solution (3–6% by weight) in water for consumer use, and in higher concentrations for industrial use. Concentrated<unk> , or "high-test<unk> ", decomposes explosively when heated and has been used as a propellant in rocketry.<unk>  is a reactive oxygen species and the simplest<unk> , a compound having an oxygen–oxygen single bond. It decomposes slowly when exposed to light, and rapidly in the presence of organic or reactive compounds. It is typically stored with a stabilizer in a weakly acidic solution in a dark bottle to block light.<unk>  is found in biological systems including the human body. Enzymes that use or decompose<unk>  are classified as<unk> ses.
Hydrogen peroxide
Carbon monoxide
Hydroxyl radical
Cyanide
Nitrosamine
Isothiocyanate
Nicosan
Hydrogen fluoride