Hydrogen Peroxide

Hydrogen Peroxide (sym. $H\_2O\_2$) is a compound of hydrogen and oxygen, containing a larger proportion of oxygen than water, the other compound of these elements. It was discovered in 1818 by Thénard, and was by him regarded as oxidised water as it very readily decomposes, when heated, into oxygen and water. The substance, when freed from water as completely as possible, is a thick transparent liquid, of specific gravity 1.45, without colour or smell, but possessing a bitter taste. It bleaches many vegetable colours, and when applied to the tongue or skin produces a white spot and gives rise to considerable pain. Its bleaching action and most of its chemical characters depend upon its powerfully oxidising properties. It is employed, in dilute solution, for the restoration of oil-paintings, its action upon these being an oxidising one.