Salon color is designed to provide complete customizable color to each individual. This means that whatever tone you want, there are professionals who are trained to ensure that you get exactly what you want. Non-professional hair color cannot achieve the same results that a professional hair colorist can. Box hair color contain metallic salts. These can be harmful to your hair weave and unpredictable, while professional color is much more predictable and healthier for the hair. When you get your hair weave colored, you want to to be sure of what the out come will be. If not done by a professional, anything can happen. If color is left on hair weave for too long, it can become over processed, which can totally change the texture of your hair. Don't take a chance on ruining your lovely brazilian hair!