Abstract: The invention concerns an oxidising aqueous composition useful in particular for disinfection, hygiene and depollution purposes, and for surface treatment (particularly a metal surface to be stripped and/or passivated), and said composition, containing in water hydrogen peroxide, a RCO2H/RCO3H mixture (wherein R is a C1-C6 aliphatic radical with linear or branched hydrocarbon chain, saturated or unsaturated), a stabilising agent which is an acid and, as the case may be, Ag+ ions. The invention is characterised in that it contains ions of at least one metal M which are ions of AgII, AgIII, VV, NbV, TaV, MoVI, WVI, CoIII, InIII or TlIII. Advantageously, said composition can be in gel form. The invention also concerns the method for preparing said composition.