The Good Housekeeping Institute breaks down why: "Other than henna, any commercially available hair dye store_bought for home use or found in salons uses chemical actives for them to work," says Birnur Aral, Ph.D., Director of the Good Housekeeping Institute's Health, Beauty and Environmental Sciences Lab. "By and large, these chemicals are synthesized substances." Even when the packaging claims to be all_natural, organic or chemical_free which is literally impossible because everything, including organic things, are made of chemicals that could basically be an outright lie. This is because the FDA can't do anything about the use of these terms regarding cosmetics.
Use the Best Shampoo on Color_Treated Hair : When you wash color_treated hair, be sure to use a color_protecting shampoo. Using a good shampoo will help your color last longer and help maintain the health of your processed hair. Avoid Sulfates on Color_Treated Hair : Sulfates can strip color from hair, so look for a sulfate_free shampoo. Sulfates contain salt, which strip away moisture, and moisture loss is one of the main causes of color fading. Use Clarifying Shampoos on Color_Treated Hair Only Before Coloring : Clarifying shampoos can strip hair color because contain a high level of detergent in order to deep cleanse and remove build_up of dirt and hairstyling products, so avoid using them unless it’s right before you are going to have your hair colored. If you have gray hair you are covering, look for a clarifying shampoo that removes hairspray resins, silicones and waxes.