A method for colouring hair comprising the steps of: i) mixing a first dye composition with a first developer composition to obtain a first hair colouring composition, wherein the first dye composition comprises one or more oxidative dye precursors and/or one or more alkalizing agents and the first developer composition comprises one or more oxidizing agents; ii) applying the first hair colouring composition to the virgin hair roots and to one or more portions of the previously coloured intermediate hair lengths and tips extending from the virgin hair roots; iii) mixing a second dye composition with a second developer composition to obtain a second hair colouring composition, wherein the second dye composition comprises one or more oxidative dye precursors and/or one or more alkalizing agents and the second developer composition comprises one or more oxidizing agents, wherein the first and second developer compositions are the same, and wherein the concentration of the oxidative dye precursors and/or the concentration of the alkalizing agents comprised in the second dye composition is lower than the concentration of respectively the oxidative dye precursors and/or the alkalizing agents comprised in the first dye composition; iv) applying the second hair colouring composition to the rest of the intermediate hair lengths and tips which are free of the first hair colouring composition; v) optionally rinsing the hair; and wherein: a. the method further comprises the steps of waiting for a time period of from 10 min to 40 min, preferably 15 min to 30 min, more preferably 20 min, which is performed between steps ii) and iv) and waiting for a time period of from 5 min to 20 min, preferably 10 min which is performed between steps iv) and v) or b. step iii) is performed immediately after step ii) and step iv) is performed immediately after step iii) and the method further comprises the step of waiting for a time period of from 5 min to 40 min, preferably 20 min to 40 min, more preferably 30 min, which is performed between steps iv) and v). i) mixing a first dye composition with a first developer composition to obtain a first hair colouring composition, wherein the first dye composition comprises one or more oxidative dye precursors and/or one or more alkalizing agents and the first developer composition comprises one or more oxidizing agents; ii) applying the first hair colouring composition to the virgin hair roots and to one or more portions of the previously coloured intermediate hair lengths and tips extending from the virgin hair roots; iii) mixing a second dye composition with a second developer composition to obtain a second hair colouring composition, wherein the second dye composition comprises one or more oxidative dye precursors and/or one or more alkalizing agents and the second developer composition comprises one or more oxidizing agents, wherein the first and second developer compositions are the same, and wherein the concentration of the oxidative dye precursors and/or the concentration of the alkalizing agents comprised in the second dye composition is lower than the concentration of respectively the oxidative dye precursors and/or the alkalizing agents comprised in the first dye composition; iv) applying the second hair colouring composition to the rest of the intermediate hair lengths and tips which are free of the first hair colouring composition; v) optionally rinsing the hair; a. the method further comprises the steps of waiting for a time period of from 10 min to 40 min, preferably 15 min to 30 min, more preferably 20 min, which is performed between steps ii) and iv) and waiting for a time period of from 5 min to 20 min, preferably 10 min which is performed between steps iv) and v) or b. step iii) is performed immediately after step ii) and step iv) is performed immediately after step iii) and the method further comprises the step of waiting for a time period of from 5 min to 40 min, preferably 20 min to 40 min, more preferably 30 min, which is performed between steps iv) and v).