Abstract: A method of applying hair treatment agents such as bleach, colorants and highlighters to a predetermined number of isolated or segregated sections of hair within a larger body of hair, the method comprising the following steps: obtaining a hair highlighting device having a main body reservoir portion extending the width of the hair highlighting device, the main body reservoir portion defined by at least 2 end portions, 2 elongated sidewalls and an opening along an upper portion, the main body reservoir portion having a lower channel with an essentially V-shaped cross-section and a plurality of lower openings located within the channel, the hair highlighting device further having a plurality of rollers coupled within the lower openings in the channel at the bottom of the main body reservoir portion and a plurality of hair gripping teeth extending downward from the openings at the bottom of the hollow main body reservoir portion, the plurality of teeth each having hair gripping apparatus at a lower end of the t