Purple shampoo, which helps preserve the tone of blonde, silver, and gray hair to prevent it from turning dull and brassy, truly is the best weapon to keep your hair looking great in between salon visits. Blonde hair, silver hair; heck, even white hair will benefit from … The best purple shampoos help prolong the life of your blonde, so you can go longer between appointments and keep unwanted brassiness at bay. The best solution for that is purple shampoo, and one of the best among those is the Clairol Shimmer Lights Purple Shampoo. John Frieda is an OG when it comes to color-specific hair products, and their Sheer Blonde Color Renew Shampoo (see at Amazon) is still one of the best… The Multi-Spectrum Defense Complex in Joico’s purple shampoo is designed to protect against color fade, so while it’s … Joico Color Balance Purple Shampoo. Purple shampoo is the answer. These shampoos are typically cool shades of purple, blue, and gray, and they help cancel out the warmth that plagues dyed hair over time. Interested in trying one … Purple shampoos are a must when keeping blonde hair bright and at its best. Best for Lasting Results. 13.