For black hair, apply henna first and indigo second, as two separate applications on the same day. Henna alone gives red. Indigo alone will not hold. Run in sequence, henna then indigo for 60 to 90 minutes, the result is dark brown to black once it finishes oxidising over the next two days.
People usually search for indigo and henna for black hair, and the order in that phrase is the wrong way round. Henna has to go first. Reverse it and the indigo has nothing to bind to, which is the single most common reason a black attempt fails.
The sequence, step by step
Mix the henna. Add warm water and something mildly acidic, lemon juice or brewed tea, until it is the texture of yoghurt. Cover it and leave it to stand. Most people give it 6 to 12 hours at room temperature. This wait is what lets the dye release; skipping it is why some applications come out weak.
Apply and wait. Work it through clean, dry hair in sections. For full grey coverage leave it on around 90 minutes. For hair that already has pigment, 45 to 60 minutes is enough. Rinse with water only. Do not shampoo.
Mix the indigo fresh. This is the part people get wrong. Indigo does not improve with standing, it degrades. Mix it with warm water immediately before you use it, to the same yoghurt texture, and get it on the hair within about fifteen minutes. A pinch of salt helps it stay put on some hair types.
Apply and time it. 30 to 40 minutes for brown. 60 to 90 minutes for black. Rinse with water only.
Then leave it alone. No shampoo for 48 hours. The colour darkens substantially over that window. What looks like a muddy dark green on the first evening settles into black by the second day, and people who panic and wash at hour six lose the result.
Two steps or one mix?
You can blend henna and indigo into a single application. It is faster and it works acceptably on hair that already has pigment and is only lightly grey.
For black, and for anything more than about 30 percent grey, two steps wins. In a single mix the two dyes compete for the same binding sites, and the outcome depends on which one gets there first, which varies strand by strand. Two applications put the henna down first as a base, deliberately, and then colour over it. You get a darker result and far better coverage on resistant grey.
| Hair | Recommended |
|---|---|
| Dark, wants black | Two steps, indigo 60 to 90 minutes |
| Mid brown, wants dark brown | One mix is usually fine, roughly 2 parts indigo to 1 part henna |
| Under 30 percent grey | One mix works |
| Over 30 percent grey | Two steps |
| Fully grey or white | Two steps, and expect to repeat within two weeks |
Ratios for the one-mix version
If you are blending, indigo is the dominant partner for dark shades. Roughly one part henna to two parts indigo gives dark brown. One to three pushes toward black but gets less reliable. More henna than indigo gives auburn and chestnut, not brown.
These are starting points, not formulas. The strength of both powders varies by crop and by age, so a ratio that worked on last season’s material can land differently on this one. Anyone producing at scale should be testing each incoming lot on swatches rather than trusting a fixed recipe.
When it comes out green, or too light
Green or blue tinge. Almost always indigo applied without enough henna underneath, or judged before it oxidised. Give it 48 hours. If it is still green, the henna step was too short or the henna was weak, and another henna application over the top will correct it.
Not dark enough. Indigo time too short, indigo too old, or grey hair that needs a second run. Indigo loses strength in storage faster than henna does, and stale indigo is the most common single cause.
Faded fast. Shampoo inside 48 hours, or sulfate shampoo afterwards. The indigo layer is the vulnerable half.
Why material quality decides this more than technique
You can follow every step correctly and still get brown if the indigo is old. It is the least stable of the two and it degrades quietly, with no change in how it looks or smells.
So ask for the crop year and the colour strength on the lot you are buying. Ask whether the indigo has been cut with cheaper leaf powder, which is common and undetectable by eye. And buy both powders from the same producer where you can, because the result depends on how the two work together, not on either one in isolation.
Sourcing both halves
We mill henna powder and indigo powder in our own plant at Sojat in Rajasthan. Both are lines we produce rather than buy in, which is what lets us hold them consistent as a pair from lot to lot. For the wider picture on what plant colour can and cannot do, see our guide to natural black hair dye.
Minimum order 50 kg on each, Certificate of Analysis on every lot with PPD tested and absent, free sample before you order, and a quote back within 24 hours to your port. We ship to buyers in more than 60 countries.
Specifications, for buyers who order to a number
Order henna on dye strength and sieve, indigo on colour strength and sieve. Every figure is confirmed on the Certificate of Analysis for the lot you receive, because all of them shift with crop, harvest and storage time. Send us what your formulation is written against and we will confirm what we can supply against it first.
Frequently asked questions
Can I mix henna and indigo together for black?
You can, but two separate steps give a darker and more reliable black, especially on grey. A single mix works acceptably for dark brown on hair that still has pigment.
How long should indigo stay on for black hair?
60 to 90 minutes after the henna step. Thirty minutes gives brown. Then leave it 48 hours without shampoo, because the colour keeps darkening as it oxidises.
Why did my hair turn green?
Usually indigo applied without enough henna beneath it, or a colour judged before it finished oxidising. Wait two days first. If it is still green, apply henna over the top and it will correct.
Does indigo paste need to sit like henna does?
No, the opposite. Henna needs hours to release its dye. Indigo degrades if it stands, so mix it immediately before use and apply within about fifteen minutes.
Can I buy henna and indigo from you together?
Yes, both are our own lines from the same plant, which is why they behave predictably together. 50 kg minimum on each, free sample, quote within 24 hours.
Specs change with the crop, the season and the grade. Ask our export desk for a current lab report, the minimum order and a price to your port, and we will come back within 24 hours.