To keep blonde color-treated hair looking vibrant between appointments, a high-quality toning purple shampoo, like one you get from the salon, is a must-have. An example is the best-selling UNITE purple toning shampoo. You want a weekly product that not only gently cleanses, but also quickly neutralizes brassy tones. When paired with a non-toning purple conditioner, it’s easy to keep blonde hair looking cool, bright, and salon-fresh.