If you have a hair dye allergy or have been advised by your physician to not use chemical hair dye, you should be able to use Ancient Sunrise® products safely.
Ancient Sunrise Sudina Indigo hair dye is all organic. You can use this with a cassia/henna or henna mix to dye hair different shades of brown all the way to midnight black. It is not as finely sifted as Zekhara Indigo, so it will require more rinsing. Using indigo only will give you blue hair.