having a circumference slightly larger than the circumference of he opening at the base of the reservoir 29 with the bottom of the sphere protruding outside the reservoir 29 the entrained strands of hair are brought in contact with the bottom of sphere the majority of the sphere 39 s surface is in contact with the liquid contained in the reservoir 29 when the device 1 is not in use as the entrained strands are pulled through the device 1 the sphere rotates and brings the liquid contained inside the reservoir 29 into contact with the entrained strands after applying the liquid to the entrained strands the sphere continues to rotate and repeats the process as the entrained strands are pulled along the roller ball mechanism may be spring activated in other embodiments of the hair color applicator the sealing mechanism can comprise a simple seal that seals the opening at the base of the reservoir 29 from the inside of the reservoir 29 when the device 1 is not is use for example a piece of plastic large enough to cover the opening at the base of the reservoir 29 that is hinged on one side of the opening can serve as sealing mechanism when the hook 14 and the hooking platform 30 u201c pinch u201d the selected stands of hair the seal is pushed away from the opening at the base of the reservoir 29 and the hair color composition flows onto the selected strands of hair when the u201c pinching u201d of the hook 14 and the hooking platform 30 is released the sealing mechanism seats back onto the opening at the base of the reservoir 29 and the flow of hair color composition is stopped through the formation of a.