Cover everything in old towels or newspaper, and wear old clothes.
Dye your hair with henna first for the best result. This helps give the indigo a base to stick to. You can mix indigo into henna to get shades of reddish-brown to auburn to brownish black.
Get 100g of indigo for every six inches of hair. Curly hair will need more. 200g is usually enough for shoulder length hair.
Mix the indigo in a plastic bowl with warm water.
Wait 10-15 minutes, you will see the green powder start to turn a deep purple black on top. When it's black, it's ready.
Get someone to help you apply the indigo, starting at the back. Cover your entire hair, and wrap it in saran wrap.
Wipe off the drips that run down, or you'll have grey streaks on your face and neck. Laying on your back helps keep the indigo from dripping down.
Rinse the indigo off with cool water after 45 minutes to an hour.
Your indigo will be dark brown at first, and deepen to black over 2-4 days. Wait several days, and reapply if you see any missed spots, or if the indigo is not dark enough.

Tips

Indigo has the consistency of wet sand. Adding an egg white or two will make it easier to work with.
This works best on dark hair, i.e. brunettes and redheads. Blondes may end up with greenish-blue hair. And not a pretty green-blue, but a swamp thing color.
You can try different amounts of henna and indigo, or mix in other botanicals to change the color. Just remember that while you only need to leave indigo on a short time, henna takes much longer. A henna mix should be left on at least 4 hours, and 8 is best.
Powdered indigo should NEVER be stored in the freezer, as this kills dye release in the plant. It is best to store it in a DRY, DARK place, and it will keep in its powder form for up to a year. An indigo mix cannot be stored, as it releases its dye quickly. Only mix as much as you need. Do not Freeze the remaining mix as you would henna; frozen indigo is useless.
Other plants that you can use on your hair include chamomile, rhubarb root, lemon juice, and cassia for blondes; henna, hibiscus, walnut powder and alma for redheads/brunettes.

Warnings

Indigo is permanent. You have to wait for it to grow out.
Indigo will permanently stain clothes, carpets, pets, and furniture, so be careful.
Indigo may slightly dry your hair. Frequent indigo users should alternate between indigo and henna. Henna conditions your hair and won't lighten the black.

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