Mehndi for Hair Colour: Pure Henna Recipe and Indigo Two-Step

If the henna packet promises black hair in 30 minutes, it isn’t just henna. Pure mehndi for hair colour gives orange to deep copper-red, takes hours, and needs a second step with indigo to go brown or black. That “instant black” is usually PPD, a chemical that can cause severe allergic reactions. Here’s how to make and use the real thing.

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Buying pure henna

Pure henna is the ground leaf of Lawsonia inermis and nothing else. When you read the ingredients, you want one word.

• Colour: fresh henna powder is green to khaki, and smells grassy, like hay or tea. Brown, dusty powder with no smell is old.
• Texture: finely sifted, silky. Grit or sand means poor sieving.
• Label: avoid “black”, “brown”, “burgundy” or “natural black” henna unless ingredients clearly list only plant powders (henna, indigo, cassia).
• Avoid: “compound henna” with metallic salts, which can react badly with chemical dyes and perms.
• Store: in a sealed bag in a cool, dark place. For long storage, freeze. Humidity weakens it.

Quick home test for dye strength, once the patch test below has come back clear: mix a teaspoon of powder with a little water, dab on your palm for 10 minutes, rinse. A clear orange stain that darkens over a day means active dye. Barely any stain means stale powder.

The patch test (don’t skip it)

1. Mix ½ teaspoon of the henna with enough water to make paste.
2. Apply a 1 cm dab behind one ear or on the inner elbow.
3. Leave for 1 hour, then rinse gently.
4. Watch the spot for 48 hours. Any itching, redness, bumps, swelling or blistering means don’t use it.

A clear patch test lowers the risk but can’t promise you won’t react later. Never patch test a product you suspect is black henna; just don’t use it. If you’ve ever had a reaction to a black henna tattoo or a hair dye, avoid henna mixes of unknown make and tell your doctor before colouring your hair with anything.

Also do a strand test: snip a small lock of hair from a hidden spot (or collect some from your comb), apply paste, and see the colour after 24 hours. Especially useful if your hair has chemical dye, keratin or relaxer treatments.

Mehndi for hair colour: the pure henna paste recipe

This makes enough for shoulder-length, medium-thick hair.

1. Put 100 g of pure henna powder in a glass, steel or plastic bowl.
2. Slowly add about 250 to 300 ml of lukewarm water (or cooled, strained black tea for richer tone), stirring well. Aim for a paste like thick yoghurt, smooth with no lumps.
3. Optional: add 1 tablespoon of lemon juice or amla powder for a slightly deeper tone. Lemon can make hair drier, so skip it if your hair is dry.
4. Press cling film onto the surface of the paste to stop it drying.
5. Leave at warm room temperature (around 25°C) for 4 to 8 hours. Dye is ready when the top layer turns slightly darker brown when you lift the film.
6. Before applying, stir in a little more water if it has thickened. You don’t want it runny.
7. Wash hair with shampoo only, no conditioner or oil. Towel dry.
8. Wear gloves. Apply petroleum jelly along the hairline and ears to avoid staining.
9. Section the hair and apply thickly from roots to ends, like icing a cake, starting where grey is most visible.
10. Pile hair up, cover with a shower cap or cling film, and leave for 2 to 4 hours. Longer gives deeper colour.
11. Rinse with plenty of lukewarm water until it runs clear. A conditioner helps slide out the grit. Avoid shampoo for 24 to 48 hours.

Colour darkens over 2 to 3 days as it oxidises. Don’t judge it on day one.

The indigo two-step for brown or black

Indigo (Indigofera tinctoria) powder stains blue. Over a henna base, it turns copper into brown or black. Indigo has to go on after henna for most people, not mixed and definitely not alone, or grey hair can turn greenish-blue.

1. Do the full henna step above and rinse. Towel dry hair.
2. Right before use, mix 100 g of indigo powder with about 250 ml of warm water and a pinch (¼ teaspoon) of salt into a yoghurt-like paste. Don’t rest it; indigo loses strength after 15 to 20 minutes.
3. Apply straight away in thick sections, roots first.
4. Cover and leave 1 to 2 hours. Longer for darker black.
5. Rinse with water only. No shampoo for 48 hours.

For a softer brown, some mix henna and indigo half and half (1:1) in one paste and apply for 2 to 3 hours; the result is lighter and less predictable than the two-step. Always patch test indigo separately.

Honest pros and cons

• Pros: covers grey with a warm colour, gives hair a glossy, thicker feel, no ammonia or peroxide, lasts well.
• Cons: messy, slow, can dry out hair, can’t be lightened afterwards, grey often goes bright orange at first, and chemical colouring over henna may give unpredictable results.
• Dry hair tip: add 1 tablespoon of plain dahi to the paste, or oil hair the night before your next wash. See our methi hair mask guide for a conditioning follow-up, and our champi guide for oiling between applications.

If your scalp has dandruff or sores, sort that first; our dandruff home remedies article helps. More traditional hair care, including reetha and shikakai washing, is in Desi Remedies.

Henna questions