It's made with a violet pigment that turns down the grey or lightened hairs to be less noticeable. There's nothing wrong with going grey, but this No Yellow Shampoo helps you keep your color consistent and vibrant. It's an easy way to help time pass with a little more grace. No Yellow is used for bleached, blonde, streaked, and grey hair. No Yellow Shampoo neutralizes yellow reflections driving from pigment residue after bleaching, lightening and the oxidizing action of the elements. No Yellow treatment is the only professional treatment formulated with a special violet pigment with intensive action that neutralizes yellow reflections giving the hair a cool, bright, even reflection.