Abstract: A composition for coloring hair is disclosed. The composition comprises, in a cosmetically acceptable solvent, at least one reducing agent with a concentration up to 2 wt. % of the composition, preferably up to 1 wt. %. Optionally, the composition comprises at least one coloring agent. The composition is free of ammonia and free of p-phenylenediamine (PPD). The mixing of the composition for coloring hair with an oxidizing composition launches an exothermic chemical reaction providing heat with a temperature that increases from room temperature TR to a temperature ranging from about (TR+3)° C. to about (TR+20)° C. A kit and a method for changing hair color are also disclosed. The compositions and methods are achieving color change results and white hair coverage with larger dye molecules than PPD, in an ammonia free environment. The exothermic properties allow obtaining uniform and rich hair colors in without ammonia or PPD.

Abstract: A method for permanently modifying a color of keratinous fibres which comprises the steps of: first providing a mixture of three compositions A, B and C, wherein said composition A comprises at least a reducing agent and optionally a coloring compound, said composition B comprises at least an alkalizing compound and said composition C comprises at least an oxidizing compound; applying said mixture to keratinous fibres for a suitable period of time for modifying the color of said keratinous fibres; and removing said mixture from said keratinous fibres.

Abstract: A method for permanently modifying a color of keratinous fibres which comprises the steps of: first providing a mixture of three compositions A, B and C, wherein said composition A comprises at least a reducing agent and optionally a coloring compound, said composition B comprises at least an alkalizing compound and said composition C comprises at least an oxidizing compound; applying said mixture to keratinous fibres for a suitable period of time for modifying the color of said keratinous fibres; and removing said mixture from said keratinous fibres.

Abstract: A method for permanently modifying a color of keratinous fibers which comprises the steps of:—first providing a mixture of three compositions A, B and C, wherein said composition A comprises at least a reducing agent and optionally a coloring compound, said composition B comprises at least an alkalizing compound and said composition C comprises at least an oxidizing compound:—applying said mixture to keratinous fibers for a suitable period of time for modifying the color of said keratinous fibres: and—removing said mixture from said keratinous fibers.