The best purple shampoos, according to our testers, include Amika, Kristen Ess, and IGK, and Nexxus. Our picks range in price from $12 to $32 and work for a variety of hair types, including those ...

According to the experts, purple shampoo can help neutralize dullness, eliminate brassiness and tone blonde hair. Here's how to use it at home for the best results.