A method for permanently modifying a color of keratinous fibres whichcomprises the steps of: - first providing a mixture of three compositions A, Band C, wherein said composition A comprises at least a reducing agent andoptionally a coloring compound, said composition B comprises at least analkalizing compound and said composition C comprises at least an oxidizingcompound； - applying said mixture to keratinous fibres for a suitable periodof time for modifying the color of said keratinous fibres； and - removing saidmixture from said keratinous fibres.
