How to Use Indigo Powder for Hair: Mixing, Timing and Aftercare

The short answer: mix indigo fresh with comfortably warm water and a pinch of salt, and put it on clean, product-free hair straight away. Leave it on for at least 1 hour and no more than 2, rinse thoroughly with water, then leave shampoo and oil for 24 hours. Indigo is never rested or soaked like henna, and almost everything that goes wrong with it starts with a paste that sat in the bowl.

What does indigo powder do to hair?

Indigo adds a cool blue colour, and henna supplies the warmth it needs to read as brown or black. Which route you use depends on the shade you want:

• Brown: one step, henna and indigo combined at 70:30, 50:50 or 30:70 henna to indigo. The full method is in mixing henna and indigo for brown.
• Black or very dark brown: two steps in one session, henna first, then 80:20 indigo to henna. See the two-step method.
• Indigo on its own: sensible on naturally dark hair or hair that already carries henna, where it cools and deepens the colour. On white, grey, blonde or bleached hair it can turn out blue, green or patchy, so henna goes first.

This page covers the handling that applies every time you use indigo, whichever route you pick.

What you need

• Spierb Indigo Powder, and Spierb Henna Powder for brown or black.
• A non-metallic bowl and spoon, comfortably warm water, and a pinch of salt.
• Gloves, sectioning clips, a shower cap or damp towel, old towels and a clock.
• Petroleum jelly for your hairline, ears and neck.

There's no gram chart for indigo, because coverage is what matters: mix enough to saturate every strand you're colouring, and more for long or thick hair. Better a little left over than paste stretched thin over resistant grey.

Before you start

Start with clean, product-free hair, and don't oil it beforehand: an oily film keeps the paste off the hair. If your hair is coated with styling product, wash it and rinse well first. For the second step of the black method, hair should be dry or damp rather than soaking wet, because surface water dilutes fresh paste.

How to mix indigo powder

1. Get everything else ready first: sections, gloves, cap, and the rested henna if your recipe uses it.
2. Put the indigo in a non-metallic bowl and add comfortably warm water gradually, mixing as you go. Boiling water isn't needed.
3. Stop when the paste is like smooth yoghurt: thick enough to stay put, soft enough to press around roots.
4. Add a pinch of salt and mix it through.
5. Don't leave it to stand. Apply it immediately.

If the paste is watery, stir in a little more powder while it's still fresh. If it's stiff and clay-like, loosen it with a splash of water so it can saturate rather than sit on top.

How to apply it

1. Smooth a thin layer of petroleum jelly along your hairline, ears and neck, keeping it off the hair you're colouring.
2. Work in small sections, starting where coverage matters most, usually the grey root line, so it gets the freshest paste.
3. Press the paste around each root section rather than brushing it over the surface, then work through the lengths if you're colouring all of it.
4. Cover with a shower cap or damp towel. Keeping the paste moist is what keeps it working; a paste that dries hard stops depositing colour and is harder to rinse out.

If your hair is long or dense, mix in manageable batches rather than leaving half the bowl ageing while you work.

How long should I leave indigo powder on my hair?

At least 1 hour and no more than 2. That applies to a one-step henna and indigo mix, to the indigo step of the two-step black method, and to indigo on its own.

Longer isn't how you get a deeper result: past two hours you gain dryness and mess rather than colour. If your result is lighter than you hoped, look at the henna foundation, the freshness of the paste and how thoroughly you saturated the hair.

Rinsing and the next 24 hours

• Rinse with plenty of water, working section by section until the water runs clear and your hair no longer feels gritty. Don't rub or detangle roughly while paste is still in the hair.
• No shampoo for 24 hours, and no oil either. Indigo keeps settling after you rinse, and an oily coating gets in the way of that.
• A light rinse-out conditioner is fine after the final rinse if you need slip for detangling.
• Judge the colour once it has dried and settled, not while it's wet. After 24 hours, go back to your usual gentle routine.

How often can I use it?

Colour again when regrowth shows or the colour has softened, which is around every four to six weeks for most people. Once your lengths are as dark as you want them, colour the roots and leave the rest alone: indigo builds with every application, so dragging paste through the lengths each time takes them darker than you intended.

Common mistakes and quick fixes

• Weak or patchy colour: the paste was mixed too early, spread thinly, or applied to oily hair. Indigo not working works through it.
• Blue or green tones: not enough warm henna underneath. See hair turned green after indigo.
• Roots lighter than the lengths: start at the roots, use finer sections, be generous with the paste and keep it covered so it stays moist.

Frequently Asked Questions

Should I use indigo powder on dry or wet hair?

Clean and dry, or lightly damp. For the second step of the black method, rinse the henna out and let your hair come down to damp before the indigo goes on. Soaking-wet hair dilutes the fresh paste where it matters.

Should indigo powder be soaked overnight?

No. That advice comes from henna, which does rest 3–4 hours, ideally 8. Indigo is the opposite: mix it when you're ready and use it immediately, because its colour activity starts as soon as it meets water and air.

Can I keep indigo overnight in my hair?

No. Rinse at the end of the 1–2 hour window. Leaving it on all night doesn't deepen the colour; it dries the hair and makes rinsing harder.

Should I cover my head after applying indigo powder?

Yes. A shower cap or damp towel keeps the paste moist and in contact with your hair for the whole hour or two, which is exactly what it needs.

When can I shampoo after applying indigo?

After 24 hours. Rinse with water only at the end of the application, use a light conditioner if you need to detangle, and leave shampoo until the colour has settled.

Is it okay to apply oil to my hair after indigo?

Wait 24 hours, then oil as usual. Oil during that first day coats the hair while the colour is still settling, which is the one thing worth avoiding.

How often can I use indigo on my hair?

Whenever regrowth shows or the colour softens, typically around every four to six weeks. Keep full-length applications occasional and work on the roots the rest of the time.

How do I wash indigo out of my hair?

Plenty of water, section by section, rinsing in the direction of the hair until it runs clear and feels smooth rather than gritty. A light conditioner helps if your hair tangles.

Can you overdye with indigo?

Yes, and that's the thing to watch. Repeated applications keep deepening porous or previously coloured lengths, so once you have the shade you want, switch to root-only maintenance.