Especially when dying your client dark: what causes a darker band around the hairline?
As stylists, we have a tendency to apply more color around the hairline after our color application is complete to ensure every single gray hair is covered. Color on top of color will result in a dark band. If you feel it is necessary to reapply around the hairline when the color application is complete, please be sure to lift the hair with your rat tail comb to ensure the ammonia vapors can escape. If the hair is extremely porous, a separate, lighter formula around the hairline may be necessary.