In permanent haircolor, such as Redken Color Gels or Redken Chromatics, artificial dyes interact with the hair's natural pigment to create a final haircolor. Therefore, the colorist must consider natural hair color and previously applied artificial haircolour to achieve the final color result. Permanent haircolor dyes are extremely small colorless molecules that penetrate through the cuticle and into the cortex with the aid of an alkaline substance such as ammonia. When these molecules combine with hydrogen peroxide, a chemical reaction occurs –they oxidize and react with other molecules called "couplers" to form complex dye molecules. The newly-formed dye molecules are embedded in the protein structure of the hair fiber, which makes them 'permanent' or more resistant to rinsing out. However, permanent doesn't have to mean monochromatic colour. Your stylist can bring you multi-dimensional results that last.