How do I maintain a permanent hair colour?

“Commitment is key,” says Tracy , If you want to change your hair, be aware that it’s chemically processed and that there’s nothing removing the artificial pigment when you shampoo. A colour treated shampoo and conditioner are sulphate free and don't contain any other harsh detergents that strip out the colour on each shampoo. The gentle ingredients of a colour safe shampoo won't exfoliate the hair – they remove oil and dirt without scrubbing into the cuticle.