Made with a violet pigment that turns down the gray or lightened hairs to be less noticeable. There's nothing wrong with going gray, 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 gray hair. Features Ideal, for gray, super lightened, or decolored hair Violet pigment tones down unwanted yellow hues on gray, light blonde, or streaked 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. How/When: Apply on damp or dry hair for 1-3 minutes and rinse. Use gloves to prevent staining of the hands. Apply once a week or when yellow becomes visible.