The best purple shampoos, according to our testers, include Amika, Kristen Ess, and IGK, and Nexxus. Our picks range in price ...

I love Olaplex No.4P because it helps keep my highlights fresh and ... neutralise yellow tones on blonde and grey hair. If you're searching for a subtle purple shampoo, this one isn't for you.

In addition, according to Papanikolas, purple shampoo will illuminate highlights on blondes and add brightness to color-treated and natural hair, ranging from gray to white shades. Begin by ...

Before using a purple shampoo, wash your hair with a clarifying shampoo. This will help remove any existing product buildup, which could prevent the purple shampoo from properly absorbing.