Natural grey coverage for 50-75% grey: which plant dye method

For 50–75% grey, use henna followed by indigo if you want a brown or black result.

The first applications may need repeating to build the result you want. Choosing a lighter shade than your ideal finished colour can also make the contrast at the roots less stark as your hair grows.

Why use two steps for brown or black?

With a high share of grey, a two-step method is the recommended plant-dye approach for brown or black. You apply pure henna first, rinse it out, then apply pure indigo. The henna provides the red-orange base; indigo over that base shifts the overall result towards brown or black.

A one-step henna-indigo mix is another option for brown shades, but it is not the same process. If you want a softer, lighter target rather than a dark result, a reddish-brown or brown mix may suit you better. Ratios are a starting point, not a guarantee of an exact colour: your starting shade and the amount of grey affect the result.

Plant dyes cannot lighten hair. Pure henna, Lawsonia inermis, gives red-orange tones only; products labelled as black, brown or blonde henna contain other plants or chemicals. Check the ingredient list rather than relying on the shade name.

How the two-step method works

Prepare and apply henna first, following the powder’s own instructions for mixing and dye release. Timing varies by powder and room temperature: some suppliers recommend about 3–4 hours, while others suggest an overnight rest of 8–12 hours. A dab on your palm or a paper towel should show an orange stain when the paste is ready.

Leave henna on your hair for a commonly used approximate time of 2–4 hours, then rinse it out. Colour intensity does not usually increase much beyond about 4 hours. Mix indigo separately with warm water only, let it rest for about 20–30 minutes, then use it promptly; mixed indigo does not keep.

Apply the indigo after rinsing the henna, ideally straight away and within about 72 hours. Follow the product’s instructions for application and timing. Indigo alone, without a henna base, can turn grey or light hair blue or green, which is why the order matters for this method.

Choose a target that suits your regrowth

If you want brown, an even, very dark result is not the only goal to consider. A lighter brown or reddish brown can leave a less obvious contrast between dyed lengths and new grey at the roots. This can be a practical choice when you have a high share of grey and prefer a softer grow-out.

For a one-step mix, the guidance gives about 70% henna and 30% indigo for reddish brown, and a 50/50 mix for brown. Dark brown uses about 25% henna and 75% indigo; dark chocolate brown uses about 30% henna and 70% indigo. These are approximate recipes, and results vary. For black, use the two-step method rather than a one-step mix.

Remember that the colour you see immediately after rinsing is not necessarily the finished shade. Henna-indigo results usually deepen over about 24–48 hours. Give the colour time to settle before deciding whether to repeat the application or adjust your target.

• Reddish brown: about 70% henna / 30% indigo.
• Brown: 50% henna / 50% indigo.
• Black: 100% henna first, then 100% indigo.

Estimate the powder amount

The amount depends mainly on hair length and thickness. These approximate totals are for one application on medium-thickness hair; thick hair needs more and fine hair less. For the two-step method, plan enough powder for both stages rather than assuming one application total will cover the full process.

Set expectations for the first applications

A high grey share can make the difference between your natural colour and the dyed lengths particularly noticeable. The first application may not give you the depth or evenness you want, so repeating the method may be needed. Avoid treating one result as a precise preview of every later application: the outcome varies with starting colour, powder and how the dye is applied.

Expect henna to look brightest and most orange just after rinsing. Its colour usually deepens over about 24–72 hours; henna-indigo results commonly deepen over about 24–48 hours. Wait for that change before judging whether your chosen shade is too light or too dark.

If you are unsure about going dark, start with a lighter brown target rather than aiming for black at once. Henna is effectively permanent: it may fade a little, but it grows out rather than washing out. That makes a cautious shade choice especially useful.

Upkeep and safety

Plan for root touch-ups as your hair grows. Henna-indigo colour often needs attention every 4–6 weeks, approximately, depending on growth and how much grey you have. You can focus touch-ups on the roots rather than repeatedly covering the lengths.

Patch test 48 hours before, behind the ear or on the inner elbow, following the product instructions, and strand test on a hidden lock or clippings. Before chemical dye or bleach over henna, strand test because compound henna can contain metallic salts; ‘black henna’ for skin often contains PPD. If you have a reaction, rinse it off and seek medical help.