Henna and indigo ratio for soft black (dark chocolate) hair

For a one-step mix, Henna Sooq lists about 30% henna and 70% indigo for dark chocolate brown, the nearest one-step shade to soft black. That is a dark chocolate brown ratio, not a soft black ratio.

For true black, use the two-step method: apply 100% henna, rinse, then apply 100% indigo. Your starting colour and the amount of grey affect how the result appears, so test a strand before colouring all your hair.

Which one-step ratio is closest to soft black?

Henna Sooq lists about 30% henna and 70% indigo for dark chocolate brown. It is the closest listed one-step shade to soft black, but the expected shade is still dark chocolate brown. It should not be treated as a soft black ratio or a guarantee of black hair.

The same supplier lists about 25% henna and 75% indigo for dark brown. This formula has slightly more indigo than the dark chocolate mix. Because the two ratios are close and results vary with starting colour and hair, test both on separate, hidden locks or clippings before choosing.

If you use a one-step mix, blend the powders in the selected proportions and follow the instructions for each powder. Avoid choosing by ratio alone: a test strand gives you a more useful preview of how that mixture looks on your own hair.

What your starting hair colour changes

Plant dyes cannot lighten hair, so the result depends on the colour you begin with. On dark brown hair, a dark chocolate mix may show as a deep brown result. On already black hair, the change may be more subtle and visible mainly as a shift in tone or a different appearance in the light.

The listed ratios describe target shades, not identical results on every head of hair. Hair that has been coloured before may also have a different base from untreated hair. If your colour is uneven, a single all-over application may not produce an even-looking result; test sections that represent the different areas.

Grey strands can show the plant-dye colour differently from darker strands. For more even results on greys, choose the two-step method rather than relying on a one-step dark brown mix. A strand test is particularly useful if you have a mixture of grey and pigmented hair.

When to choose the two-step method

Choose two-step if your aim is true black, or if you want a more even result across grey hair. First apply 100% henna, then rinse it out. Next, apply 100% indigo. The henna stage provides the base for the indigo, which is why this method differs from mixing both powders together.

For the black result, apply indigo ideally right after rinsing out the henna and within about 72 hours. Henna-indigo colour can deepen over about 24–48 hours, so do not judge the result immediately after rinsing. Let the colour develop before deciding whether the final shade is right for you.

If you want dark chocolate brown rather than true black, a one-step ratio may be more appropriate. If you want black, changing a one-step mix to contain more indigo does not make it equivalent to the separate henna-first, indigo-second method.

Mix and apply each powder correctly

Follow the instructions supplied with your henna. Dye-release timing varies by powder and room temperature: some suppliers suggest about 3–4 hours for their blend, while others suggest an overnight rest of about 8–12 hours. A small dye-release check can help: a dab on your palm or a paper towel should show an orange stain when the henna is ready.

Mix indigo with warm water only, let it rest for about 20–30 minutes, then use it promptly. Indigo does not keep once mixed. Prepare it when you are ready to apply the indigo stage, rather than mixing it in advance and leaving it to stand.

For the two-step method, keep the applications separate: apply henna, rinse, then apply freshly mixed indigo. Use the product directions for application and rinsing. If you are following a supplier’s specific process for a powder blend, its instructions take precedence over general guidance.

What to expect after rinsing

The colour may look different just after rinsing than it does later. Henna-indigo results deepen over about 24–48 hours. Wait through that period before assessing the settled shade, and compare it with your strand-test result rather than expecting a particular name such as dark chocolate or black to look identical on everyone.

Henna-indigo colour usually needs root touch-ups as your hair grows. Touch-ups are often needed every 4–6 weeks, depending on growth and the proportion of grey. A root-only application can keep the lengths from receiving repeated full applications, but follow the powder instructions and check how your own colour behaves.

Plant dyes cannot lighten hair. Pure henna gives red-orange tones, while the final brown or black result depends on indigo and the application method. Check that the powders are the intended ingredients: products marketed as black, brown or blonde henna contain other plants or chemicals, rather than being pure henna.

Safety and strand testing

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

These are the supplier's named starting points: 25/75 (dark brown) actually carries slightly more indigo than 30/70 (dark chocolate brown), so strand test both.