Applicator for applying a hair treatment composition to a bundle of hair strands

1. An applicator for applying a hair treatment composition to the hair comprising a plate and a containment portion;

wherein said plate has a perimeter, a substantially flat internal surface and an external surface; wherein said containment portion comprises a base and a wall, said wall emerging from said base and extending upwardly, said wall having a rim and said rim defining an opening and an internal volume of said containment portion;

wherein said plate and said containment portion are movably joined by a connection so that said applicator may alternate between a closed state and an open state, wherein when said applicator is in a closed state, said substantially flat internal surface of said plate is in a juxtaposed relationship to said opening of said containment portion and wherein when said applicator is in an open state, said substantially flat internal surface of said plate is in a distal relationship to said opening of said containment portion;

wherein a first fin projects independently from said substantially flat internal surface of said plate and forms with said substantially flat internal surface an acute angle α of from about 25° to about 55°; wherein said first fin extends for an average first length (L 1 ) of from about 1 mm to about 50 mm; wherein said first fin comprises a proximal edge and a free distal edge; wherein said proximal edge is attached to said substantially flat internal surface of said plate.

2. The applicator according to claim 1 , wherein a second fin projects independently from said first fin from said substantially flat internal surface of said plate and independently forms with said substantially flat internal surface an acute angle β of from about 25° to about 55°; wherein said second fin extends independently from said first fin for an average second length (L 2 ) of from about 1 mm to about 50 mm; wherein said second fin comprises a proximal edge and a distal edge; wherein said proximal edge is attached to said substantially flat internal surface of said plate.

3. The applicator according to claim 2 , wherein said acute angles α and/or β are from about 35° to about 55°.

4. The applicator according to claim 2 , wherein said acute angle α and said acute angle β are substantially identical.

5. The applicator according to claim 2 , wherein said average first length (L 1 ) and said average second length (L 2 ) are substantially identical.

6. The applicator according to claim 2 , wherein said first fin and said second fin project independently from said substantially flat internal surface of said plate and wherein said distal edges verge one toward the other.

7. The applicator according to claim 1 , wherein said proximal edge of said first fin is substantially parallel to said proximal edge of said second fin.

8. The applicator according to claim 1 , wherein said substantially flat internal surface of said plate comprises an axis Y which extends straight from the centre of said substantially flat internal surface of said plate and crosses transversally said connection, and wherein said proximal edge of said first fin, is substantially parallel to said axis Y.

9. The applicator according to claim 1 , wherein when said applicator is in closed state, said applicator comprises an average distance (D 1 ) from said substantially flat internal surface of said plate to said rim of said wall of said containment portion, wherein said average distance (D 1 ) is from about 0.5 mm to about 5.0 mm.

10. The applicator according to claim 1 , wherein said perimeter of said plate has a substantially identical extension of said rim of said wall of said containment portion.

11. The applicator according to claim 1 , wherein said first fin and/or said second fin comprises a flexible material.

12. A method to treat the hair wherein one hair strand are contacted with the applicator according to claim 1 .

13. The method according to claim 12 , wherein a hair treatment composition is loaded into said applicator, said applicator is positioned at the root-line of said one hair strand, in an open state and then subsequently brought into a closed state, and wherein said applicator is swiped along the length of said one hair strand.

14. A kit comprising at least one applicator according to claim 1 and one or more individually packaged hair treatment compositions.

15. The kit according to claim 14 , further comprising instructions for using said applicator.

16. The kit according to claim 14 , wherein said one or more individually packaged hair treatment compositions comprises at least a first and a second individually packaged hair treatment composition, wherein said first and second individually packaged hair treatment composition are mixed to form a third hair treatment composition, and wherein said first individually packaged hair treatment composition comprises an oxidizing agent and wherein said second individually packaged hair treatment composition comprises an alkalizing agent.

17. The kit according to claim 16 , wherein at least one of said first or second individually packaged compositions comprises a persulfate salt.