The Rejuvenol Brazilian Keratin Treatment for Blonde Hair is specially formulated to smooth, straighten and relax blonde hair without damaging color. This treatment can also be used on gray shades of hair. The Rejuvenol Brazilian Keratin Blonde Hair Treatment is designed to remove brassiness and enhance the appearance of blonde and gray hair. The treatment is designed to keep your hair straight and relaxed for 3-6 months. The treatment can also be used on colored or highlighted hair