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

Calling all brunettes who like to keep things cool - you can wave goodbye to warm hues by investing in a blue shampoo.

Multiple videos uploaded under the hashtags see brunettes applying purple ... bottle of shampoo for no reason. Those with brunette hair will see a much bigger difference in using blue shampoo.