The best shampoos for color-treated hair are sulfate-free and specifically formulated to protect hair color. Look for shampoos containing antioxidants and UV protectants to help prevent fading and damage. Ingredients like argan oil and keratin can also help maintain moisture and strength.

After dyeing your hair, use a color-safe, sulfate-free shampoo. Wait at least 72 hours after coloring before shampooing to allow the hair cuticle to fully close and lock in the color. This will help prevent premature fading.

The best shampoo for colored hair is one that is gentle, sulfate-free, and pH-balanced. These shampoos help to cleanse the hair without stripping away the color molecules, prolonging the vibrancy and longevity of your dye.

Purple shampoo, while great for maintaining blonde or silver tones, can sometimes dull darker shades or cause unevenness if overused or improperly applied. Your hairdresser may have advised against it if your color isn't prone to brassiness or if your hair is already dry or damaged.