HAIR LIGHTENING COMPOSITION COMPRISING HYDROGEN PEROXIDE, A PEROXYGENATED SALT, A BICARBONATE AND AT LEAST ONE POLYPHOSPHORUS DERIVATIVE

The present invention relates to a composition for lightening keratin fibres, in particular human keratin fibres such as the hair, comprising (a) one or more chemical oxidizing agents chosen from hydrogen peroxide and/or one or more hydrogen peroxide-generating systems other than peroxygenated salts; (b) one or more bicarbonates and/or one or more bicarbonate-generating systems, (c) one or more polyphosphorus derivatives, in a total content of greater than or equal to 0.5% by weight, relative to the total weight of the composition, (d) one or more peroxygenated salts, and preferably the pH of the composition being less than or equal to 11, preferably less than or equal to 10. The invention also relates to a lightening process using said composition, and also to a multi-compartment device which is suitable for using said lightening composition.