Hydrogen Peroxide - H₂O₂ is a very pale blue liquid, slightly more viscous than water, and appears colorless in dilute solution. It is a weak acid, has strong oxidizing properties, and is a powerful bleaching agent. It is used as a disinfectant, antiseptic, oxidizer, and in rocketry as a propellant. The oxidizing capacity of hydrogen peroxide is so strong that it is considered a highly reactive oxygen species. In organisms, hydrogen peroxide is naturally produced as a byproduct of oxygen metabolism; which harmlessly and catalytically decomposes low concentrations of hydrogen peroxide to water and oxygen.