Demi-permanent and permanent color both utilise oxidative dyes and peroxide to develop the color. These kits contain two bottles that you mix together to get your color. The color they develop is very intense and developed to last 6–8 weeks. Permanent hair color will also lighten your natural hair color if desired. John Frieda® Colour Refreshing Gloss Cool Brunette is made with mild cosmetic dyes, which are found in many beauty products. This brunette hair gloss is designed just to add a hint of color and shine to refresh hair color. It will not lighten hair color.