Treat, tone and nourish blonde hair with the Theorie Brilliant Blonde Duo. Formulated with powerful botanical extracts, including strengthening sage, your blonde or silver hair will be looking and feeling stronger, healthier and more beautiful than ever! Safe for keratin treated and coloured hair, this pack helps restore radiance to dull, brassy or damaged blonde or silver hair. Theorie Purple Sage Brightening Shampoo helps to restore tone to blonde and silver hair. Theorie Purple Sage Brightening Conditioner leaves hair looking stronger, healthier and shinier while neutralising yellow or brassy tones.