Hi Rez is fade-resistant permanent hair color specially formulated to give naturally dark hair vibrant, high impact color in one application. Hi Rez features Quadro-Conditioning, a maximum conditioning system thatwill help to maintain the shine and vitality in your hair after coloring. Hi Rez works best on hair that has NOT been previously colored with dark brown or black color. We recommend that you wait until your existing color has completely grown out before you apply. Accentuate your signature beauty and style with vibrant color. Choose from Hi Rez 13 vivid shades and make the ultimate statement!