Transform your dark hair into vibrant red without the hassle of using bleach to pre-lighten, by using this NEW Highlights Red Contrast permanent hair dye. This Smart Beauty hair colouring kits uses the latest salon quality hair colouring technology and make it accessible and affordable for home use. With 100% grey coverage we place great emphasis in achieving intense colour results - as you would expect from a professional salon - yet they are easy and safe to use. Not suitable for resistant, Asian or Afro Caribbean Hair. What is Colour Plex? You may have seen brands like Olaplex hair treatment in professional salons. Plex hair treatment has been described as ‘the single most important development in hair colour’.