How to Dye Hair Black with Henna and Indigo (The Two-Step Method)

The short answer: black takes two steps in the same session. Henna goes on first for at least 2 hours to build a warm base, then you rinse, let your hair come down to damp, and apply a fresh mix of 80% indigo to 20% henna for 1–2 hours. Rinse with water, and leave shampoo and oil for 24 hours. Allow an afternoon, and expect black to very dark brown on grey or white hair.

What happens if you apply indigo without henna?

On white, grey, blonde or bleached hair, indigo on its own has nothing warm to work against, so it can come out blue, green, smoky or patchy. That's the single most common disappointment with indigo, and it isn't a fault in the powder.

On naturally dark hair, indigo alone behaves differently: it cools and deepens what's there, sometimes with a blue-black shine in strong light, but it won't change the shade dramatically. And on hair that already carries henna, indigo alone works well, because the warm layer is already in place.

Does indigo powder make hair black?

Yes, as the second half of the pair. Henna lays down copper; indigo lays cool blue over it; your eye reads the two together as brown, very dark brown or black. Your starting colour still shapes where it lands:

Mixing both powders into one paste gives brown rather than black. If brown is what you're after, use the one-step method instead.

What you need

• Spierb Henna Powder and Spierb Indigo Powder. As a starting point for henna: about 30–50 g for short hair, 75–100 g for shoulder-length, 150 g or more for long or thick hair. Mix enough henna for step 1 and a saved portion for step 2.
• Two non-metallic bowls and a spoon, comfortably warm water (or warm filtered tea for the henna), and a pinch of salt for the indigo.
• Gloves, clips, a shower cap or damp towel, old towels and petroleum jelly.
• An afternoon: the henna step alone is 2 hours or more.

Before you start

Start with clean, product-free hair, and don't oil it beforehand. Don't colour over cuts or an inflamed scalp, and keep both powders away from your eyes, eyebrows and eyelashes.

Step 1: the henna foundation

1. Mix the henna in a non-metallic bowl with comfortably warm water (or warm filtered tea) added gradually, to a smooth, thick-yoghurt paste.
2. Cover it and rest it for 3–4 hours, ideally 8, so the colour releases.
3. Smooth petroleum jelly along your hairline, ears and neck, keeping it off the hair.
4. Apply the rested henna generously in 4–6 sections, saturating grey and white roots rather than skimming them. Set aside the portion you saved for step 2.
5. Cover with a shower cap or damp towel and leave it on for at least 2 hours. Longer is better, as long as the paste stays moist.
6. Rinse thoroughly with water. No shampoo and no oil between the steps.
7. Let your hair dry down to damp. Damp is fine; soaking wet isn't.

Your hair will be copper at this point, and bright copper on grey. That's the base doing its job, not the finished colour. Go straight on to step 2.

Step 2: the indigo-dominant layer

1. Only now, mix the indigo with comfortably warm water to a smooth yoghurt paste and add a pinch of salt.
2. Combine it immediately with the saved rested henna at 80% indigo to 20% henna.
3. Apply straight away, saturating the roots and any grey completely.
4. Cover, and leave it on for at least 1 hour and no more than 2, towards the longer end for the deepest result.
5. Rinse thoroughly with water. No shampoo and no oil for 24 hours.

What to expect afterwards

The colour keeps settling after you rinse, so don't judge it while your hair is wet. Let it dry and give it the first day before deciding whether anything needs adjusting. If a green or blue cast is still obvious once it has settled, the henna base was too light or uneven rather than the indigo being wrong, and the green-hair page covers the fix.

Colour also builds. A first attempt on a lot of resistant grey often lands at very dark brown, and the next one takes it further. That's normal, and it beats leaving the paste on longer.

If your grey resists

Resistant grey usually comes down to coverage rather than stubborn hair. Wash out any oil or product first, work in small sections, saturate every pale root, keep the paste moist under a cap, use fresh indigo and give step 2 its full 1–2 hours. Don't try to compensate by mixing the indigo early or leaving it on longer.

Keeping it up

Colour the roots every four to six weeks or so, doing both steps in order: henna, rinse, then the 80:20 indigo mix. Plant colour grows out rather than fading away, so most of the work is new growth. Take both pastes through the lengths only when they really need refreshing, or the ends keep getting darker.

Frequently Asked Questions

Can indigo powder turn grey hair black?

With the two-step method, yes: grey typically goes black to very dark brown. Henna first gives the grey its warm base, and the indigo-dominant second step turns that into dark colour. Indigo alone on grey doesn't do it.

Does indigo powder make hair black permanently?

It's long-lasting rather than permanent. The colour grows out with your hair and softens gradually, so most people refresh the roots around every four to six weeks.

Can I use indigo powder without henna?

On already-dark or henna-coloured hair, yes, to cool and deepen the shade. On grey, white, blonde or bleached hair it isn't the route we'd recommend, because it can look blue or green.

What should I mix with indigo powder for black hair?

Warm water, a pinch of salt and your saved rested henna, so step 2 works out at 80% indigo to 20% henna. Nothing else goes in the indigo paste.

Can I apply henna and indigo on the same day?

Yes, and you should: both steps belong in one session. Rinse the henna, let your hair come down to damp, then mix the indigo and get it on. There's no need to wait overnight or leave it for the weekend.

Why can't you use "indigo black henna" on grey hair?

Because products sold as black henna usually get their colour from added dye rather than leaf, and because indigo on its own over grey has no warm base to work with. Pure henna first, then pure indigo, is the route that works.

How do I make henna black naturally?

Henna alone never goes black: it gives copper, red or auburn. Black comes from following it with the indigo-dominant step in the same session, as above.