Coloring hair comprises preparing a ready for use dye composition by mixing of a first composition comprising one or more dye precursors, a second composition comprising one or more oxidants and a third composition comprising one or more organosilicon compounds comprising silanes having a silicon atom and siloxane comprising two or three silicon atoms applying the composition on the hair for a sufficient time to obtain the desired coloration and rinsing the composition. Coloring hair comprises preparing a ready for use dye composition by mixing of a first composition comprising one or more dye precursors, a second composition comprising one or more oxidants and a third composition comprising one or more organosilicon compounds comprising silanes having a silicon atom and siloxane comprising two or three silicon atoms, where the organosilicon compounds further comprises one or more basic chemical functions and one or more hydroxyl groups or hydrolyzable by molecule applying the composition on the hair for a sufficient time to obtain the desired coloration and rinsing the composition. An independent claim is included for ready for use composition comprising one or more dye precursors one or more organosilicon compounds one or more cationic polymers of which the cationic charge density is >= 4 and/or one or more nonionic polyoxyalkylenated or glycerolated surfactant.La présente invention a pour objet un procédé déclaircissement et/ou de coloration de fibres kératiniques humaines, mettant en oeuvre*une composition substantiellement anhydre ou aqueuse (A) comprenant un ou plusieurs corps gras exempts de groupe acide carboxylique, un ou plusieurs tensioactifs,* une composition substantiellement anhydre ou aqueuse (B) comprenant un ou plusieurs composés amino-trialcoxy silanes ou amino-trialcényloxy silanes particuliers,* une composition aqueuse (C) comprenant un ou plusieurs agents oxydants.Elle concerne enfin un dispositif à trois compartiments, approprié pour la mise en
