Ultra-violet pigment, Brass Reducing, Intense Toning, Shine Restoring, Sulfare-free. The One Purple Shampoo features an ultra-violet pigment that offers intense toning for blondes and brunettes, removing unwanted brass and yellow or warm tones in natural and color treated hair. The One Purple Shampoo features an ultra-violet pigment that offers intense toning for blondes and brunettes, removing unwanted brass and yellow or warm tones in natural and color treated hair.