Review on ORGANIC INDIGO POWDER for Hair Dye/Color - The Henna Guys (200g) by Michelle Green

Works great gives a rich black covering some of the gray hair I had. A few things to know: Indigo powder works best on hair that has been previously dyed with henna, which allows the indigo to bind the henna. I applied indigo powder 2 days after applying henna (also from the henna guys). Also apply indigo powder immediately after mixing. The first time I waited 15 minutes as some recipes say and this color didn't take very well. The dye has already come out and oxidized. The second (and lucky) time I mixed the indigo powder with salt and warm water and applied it straight away. Then I covered my head with cling film and let it sit for 2-3 hours. Rinse with cold water until clean. (shampoo and conditioner after a few days)