What it is: Purple Toning Sulfate-Free Shampoo - Banish Brass forever with What it does: THE PERFECT BLONDE purple toning regimen from the brand that knows color! Uitlizing a special dye to beautifully tone hair with no sulfates, cleanses and softens and brightens blonde hair like never before. Perfect your blonde and kick brass every time you shampoo and condition.. What else you need to know: Duel ultra-violet dye system purifies and neutralizes unwanted yellow tones. Optical brighteners perfect and enhance blonde radiance. Sulfate-free formula gently cleanses (one of the few available sulfate-free blonde shampoos).