NEW DYES WITH HETEROCYCLIC DISULPHIDE UNIT, COLOURING COMPOSITION COMPRISING THEM, AND METHOD FOR DYEING HUMAN KERATINOUS FIBRES ON THE BASIS OF THESE DYES
The invention relates to the dyeing of keratinous materials using dyes having a heterocyclic disulphide group. The invention provides a colouring composition comprising a fluorescent dye having a heterocyclic disulphide group, a method for dyeing, with in particular a lightening effect, of keratinous materials such as the hair, employing said composition. It likewise provides new dyes having a heterocyclic disulphide group, and the uses thereof in the lightening of keratinous materials. This composition produces a lightening effect which is particularly tenacious and visible on dark keratinous fibres.
