Hair colouring methods and kits thereof
View Patent ↗Method for coloring hair wherein a non-diluted hair coloring composition is applied to the hair, e.g. the hair roots and a diluted hair coloring composition is applied to the hair, e.g. the hair lengths and tips, wherein a dilutant composition comprising water and/or a non-aqueous liquid is added to the non-diluted hair coloring composition to obtain the diluted hair coloring composition.
1. A method for colouring hair comprising the steps of:
i) mixing a developer composition with a dye composition to obtain a non-diluted hair colouring composition, wherein the developer composition comprises one or more oxidizing agents and the dye composition comprises one or more oxidative dye precursors and/or one or more alkalizing agents;
ii) applying a first portion of the non-diluted hair colouring composition obtained in step i) to the hair and retaining a second portion of the non-diluted hair colouring composition obtained in step i);
iii) mixing the second portion with a dilutant composition comprising water and/or a non-aqueous liquid at a mixing ratio of less than about 1:2 to obtain a diluted hair colouring composition;
iv) applying a portion or all of the diluted hair colouring composition to the hair.
2. The method according to claim 1 , wherein the first portion of the non-diluted hair colouring composition is applied to the hair roots and the portion or all of the diluted hair colouring composition is applied to the hair lengths and tips.
3. The method according to claim 1 , wherein the method further comprises the step of:
v) rinsing the hair.
4. The method according to claim 3 , wherein the method further comprises the steps of waiting for a time period of from about 10 min to about 40 min which is performed between steps ii) and iv) and waiting for a time period of from about 5 min to about 20 min which is performed between steps iv) and v).
5. The method according to claim 3 , wherein 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 about 5 min to about 40 min which is performed between steps iv) and v).
6. The method according to claim 1 , wherein the non-aqueous liquid is a water-miscible liquid or a water-immiscible liquid.
7. The method according to claim 6 , wherein the water-miscible liquid is selected from the group consisting of alcohols, ethers, esters and mixtures thereof.
8. The method according to claim 6 , wherein the water-miscible liquid is selected from the group consisting of glycerin, propylene glycol and mixture thereof.
9. The method according to claim 6 , wherein the water-immiscible liquid is an oil.
10. The method according to claim 1 , wherein in step ii) from about 95% to about 10% by weight of the non-diluted hair colouring composition obtained in step i) is applied as a first portion to the hair.
11. The method according to claim 1 , wherein the developer composition comprises from about 1% to about 20% by weight of the oxidizing agents and the dye composition comprises from about 0.01% to about 10% by weight of the oxidative dye precursors and from about 0.1% to about 10% by weight of the alkalizing agents.
12. The method according to claim 1 , wherein each of the non-diluted hair colouring composition and the diluted hair colouring composition has a viscosity which induces a shear stress of from about 20 to about 200 Pa at 10 s −1 as measured according to the viscosity test method.
13. The method according to claim 1 , wherein the non-diluted hair colouring composition has a viscosity which induces a shear stress of from about 20 to about 200 Pa at 10 s −1 as measured according to the viscosity test method and the diluted hair colouring composition has a viscosity which induces a shear stress of from about 20 to about 180 Pa at 10 s −1 as measured according to the viscosity test method.
14. The method according to claim 1 , wherein the non-diluted hair colouring composition and the diluted hair colouring composition are applied to the hair with a brush and bowl applicator or a container to which a nozzle or a separate applicator device is attached.
15. The method according to claim 1 , wherein the non-diluted hair colouring composition comprises at least one gel network thickener system.
16. The method according to claim 1 , wherein the developer composition comprises a thickener selected from acrylates copolymer, hydrophobically modified acrylate copolymers and mixtures thereof.
17. A hair colouring kit comprising a developer composition comprising one or more oxidizing agents, a dye composition comprising one or more oxidative dye precursors and/or one or more alkalizing agents and a dilutant composition comprising water and/or a non-aqueous liquid as defined in claim 1 .
18. The hair colouring kit according to claim 17 , wherein the kit further comprises a brush and bowl applicator.
19. The hair colouring kit according to claim 17 , wherein the developer composition, the dye composition and the dilutant composition are provided as separate containers and the kit further comprises a nozzle.