How long do I need to wait after chemical coloring to color with EarthDye henna?

Hi Mia, you can color chemically treated hair anytime before or after using chemical hair dye. Blond highlights might come out lighter, meaning if you use dark brown over bleached blond, it will come out more of a light brown or medium brown. If you did your hair with chemical brown, then you can use our brown to do the roots and blend it in. You can use indigo to darken the brown, or you can use light brown mixed with brown to make it lighter.