Henna on grey hair: what colour to expect and how to apply

On grey hair, pure henna gives a vivid copper-orange colour that usually deepens over about 24–72 hours. Repeated applications can make the colour look richer.

For brown or black, use henna with indigo rather than pure henna alone. Your starting hair is grey, so expect a visible contrast between the henna-coloured lengths and any new grey roots.

What colour does pure henna give grey hair?

Pure henna, made from Lawsonia inermis, gives red-orange tones. On grey hair, which has little or no underlying pigment, this usually appears as a bright copper or orange rather than the subtler red tones it may create over darker hair. The result can look vivid, especially when the grey is concentrated around the hairline or temples.

Henna cannot lighten hair, and pure henna does not produce brown, blonde or black. Products sold under those shade names contain other plants or chemicals, so check the ingredient list rather than relying on the word “henna” on the label.

Immediately after rinsing, the colour may look particularly bright orange. It usually deepens over about 24–72 hours as it oxidises. Judge the result after that time, rather than deciding from the first rinse.

How repeated applications affect the shade

A further application can make henna-coloured lengths look richer or more saturated. The change varies with your hair and the product, and repeated applications still keep pure henna within its red-orange colour family; they do not turn it brown or black.

If you apply henna over the full length each time, the lengths receive repeated colour as well as the new grey at the roots. If you want to limit further build-up on the lengths, focus later applications on the regrowth and avoid spreading paste over already-coloured hair unnecessarily.

Henna is effectively permanent: it may fade a little, but it generally grows out rather than washing out. New grey roots will therefore contrast with the coloured hair, so plan for root applications as they appear.

How much henna powder to prepare

Use hair length as a starting point. These approximate amounts are for medium-thickness hair; thick hair needs more and fine hair less. You may need to adjust the amount to coat your hair thoroughly.

• Choose the closest length description, then allow for your hair’s thickness and how much paste you need for even coverage.

Prepare and apply the henna

Follow the instructions supplied with your powder: dye-release time varies by powder and room temperature. Some suppliers advise about 3–4 hours, while others suggest leaving the mixture overnight, about 8–12 hours. Do not assume one timing suits every henna.

Check for dye release with a small dab on your palm or a paper towel. An orange stain indicates that the paste is ready. Apply it evenly so the grey sections are coated, working through the hair in manageable sections and using enough paste to cover the strands.

Leave the paste on for about 2–4 hours, which is common practice. Colour intensity does not increase much beyond about 4 hours. Rinse thoroughly, then allow the colour to develop before assessing the final shade.

When to add indigo

Choose henna alone if you want the copper-orange result. If you want brown, mix henna and indigo in a one-step application: a roughly even mix is used for brown, while a higher proportion of indigo gives darker brown shades. Henna Sooq guidance gives about 50% henna and 50% indigo for brown, and about 25% henna and 75% indigo for dark brown.

For black, use a two-step method: apply 100% henna first, rinse, then apply 100% indigo. The indigo is ideally applied right after the henna and within about 72 hours. Follow the powder instructions for each step. Indigo alone, without a henna base, tends to turn grey or light hair blue or green.

Indigo behaves differently from henna once mixed: mix it with warm water only, leave it for about 20–30 minutes, then use it promptly. It does not keep once mixed. Henna-indigo results can deepen over about 24–48 hours, so wait before judging the shade.

Roots, upkeep and safety

With henna-indigo colour, root touch-ups are often needed every 4–6 weeks, depending on how quickly your hair grows and how much grey is visible. Pure henna also grows out, so touch-up timing depends on how noticeable the contrast is to you.

Patch test 48 hours before use behind the ear or on the inner elbow, following the product instructions, and strand test on a hidden lock or hair clippings. “Black henna” for skin often contains PPD and can cause serious skin reactions; before using chemical dye or bleach over henna, strand test because compound henna can contain metallic salts. If you have a reaction, rinse it off and seek medical help.