A method for dyeing keratinous substances.

A process for dyeing keratinous SUBSTANCES such as hair, wool, leather, etc., is to put them in contact with a composition containing a component based on an azide or azidoindole Aromatics formula given in memory and then EXPOSE THE MATERIAL keratinous CONTACTED A LIGHT SOURCE FOR A PROPER TIME TO DEVELOP THE COLOR. The composition may also optionally contain a coupling colored component capable of interacting with BLISS azide or azidoindole AROMATICOS.