| http://www.w3.org/ns/prov#value | - It is not excluded, even if this does not correspond to a preferred embodiment of the invention, for the composition to contain at least one oxidizing agent chosen, for example, from hydrogen peroxide, urea peroxide, alkali metal bromates, persalts such as perborates and persulfates, and enzymes such as peroxidases and two-electron or four-electron oxidoreductases.
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