You can either mix the henna and indigo together to get a red/brown or brown shade, or to get a black shade on grey hair you would do a 2 step process, first dye your hair with henna, then dye your hair with indigo.
It's Pure Natural Hair Dye - Organic Henna & Indigo Hair Colour 200g
Natural Hair Dye - Organic Henna & Indigo Hair Colour 200g (Pack of 2)
