Preparation of an aqueous solutions (A) of reactive chlorine compounds (I) comprises: (a) reacting chlorine dioxide with an aqueous solution of hydrogen peroxide at at least pH 6.5； (b) reducing the pH to 3-6； (c) driving out the produced (I) with a flow of cooled gas and trapping in a basic solution, and (d) contacting trapped (I) with upto 100 (preferably 10) times excess of chlorite at pH 6-8, preferably 7. Preparation of an aqueous solution (A) of reactive chlorine compounds, preferably dichlorous acid and peroxochlorous acid comprises: (a) reacting chlorine dioxide with an aqueous or water-containing solution of hydrogen peroxide (or some other peroxide or hydroperoxide) at at least pH 6.5； (b) reducing the pH to 3-6 by adding acid； (c) driving out the produced (I) with a flow of cooled gas and trapping in a basic solution (pH over 10), and (d) contacting the trapped (I) with upto 100 (preferably 10) times excess of chlorite at pH 6-8, preferably 7. Independent claims are also included for the following: (1) (A) prepared as above； (2) dichlorous acid of formula H 2Cl 2O 6 (IA), its derivatives, anions of formulae (II)-(V) and salts； (3) peroxochlorous acid of formula O=Cl-OOH (IB), its derivatives and salts； and (4) alkali-, alkaline earth-, zinc-, ammonia- and amine salts of the dichlorous acids and their derivatives. [Image] ACTIVITY : Vulnerary； Immunomodulator； Dermatological； Antiseborrheic； Antibacterial. MECHANISM OF ACTION : None given.
