abstract |
The subject of the present invention is disymmetric diazo compounds containing a 2-pyridinium group and comprising a cationic or non-cationic linker.n n n The invention furthermore relates to dyeing compositions comprising, in a medium which is suitable for dyeing keratinous fibers, such compounds as a direct dye, as well as a method for dyeing keratinous fibers using this composition and a device with several dyes. compartments. |