dims the brassiness [SEP] using this product while my dyed hair grows out after using a color stripping product which left the dyed sections abit brassy roots are growing in nearly white this shampoo does a great job of dimming the brassy tones i use it every other time i shampoo leaving it on my hair for about minutes while i shower then rinse it out and apply a conditioner it turns my very white hair in front just a tiny bit purplish bluish but that actually seems to fade after a day and certainly after the next wash