Before and After Plant-Based Hair Colour: Salon Results at Home

Everyone wants to know one thing before they colour their hair at home: will it actually work? Not in a studio, not on a model with perfect lighting, but on real hair, in a real bathroom, with grey roots that have been creeping in for months. So rather than tell you, we will show you. Below are the before-and-after results our customers have sent us, sorted by shade, with one honest commentary running through all of them: what plant-based colour can do, and what it genuinely cannot.

The headline is simple. Nearly 100% grey coverage, at home, on the darker shades. No ammonia, no PPD, no resorcinol, no oxidant. And one thing that makes the difference between a disappointing result and a salon-grade one: the two-step Method, with the thermometer that comes in the box.

Chestnut — our customers' results

Chestnut is where most people start, and it is the shade that flatters the widest range of complexions. In the before photos, the greys sit mostly around the temples and the parting; in the after photos, they have melted into a warm, even chestnut with real depth in daylight. This is the sweet spot for plant-based colour. The pigments from henna and a touch of indigo settle into the hair fibre and build a tone that looks lived-in rather than flat, which is exactly why grown-out roots are so much more forgiving than they are with a box dye.

The customers who get the best chestnut results have one habit in common: they do not skip the first step. The preparation sachet opens up and conditions the fibre so the colour has something to grab onto. Skip it, and chestnut can look patchy on stubborn greys.

Hazelnut — our customers' results

Hazelnut is the lighter, softer cousin of chestnut, with more of a caramel warmth running through it. In the after photos you can see how it catches the light: golden where the sun hits, deeper at the back. It suits people who want coverage without going too dark, and it is forgiving on hair that has never been coloured before.

A word of honesty here, because it matters. Hazelnut warms the hair; it does not lift it. If your natural base is dark, hazelnut will add warmth and shine and cover your greys, but it will not turn you into a lighter brunette. Plant pigments deposit colour on top of what you already have, they never strip it out. That is not a limitation we hide, it is simply how botanical colour works.

Espresso — our customers' results

Espresso is where the grey coverage looks almost theatrical in the before-and-after shots. A scattering of white at the front, then a deep, glossy near-black-brown that reads as expensive. On the darker end of the range, this is where you reliably reach close to 100% coverage, even on hair that other methods had struggled with.

The depth of espresso comes from indigo layered over a henna base, and that layering is exactly why temperature matters. The pigments only release properly when the paste is at the right warmth, which is the whole reason the thermometer is in the box. Customers who hit the temperature get that rich, uniform espresso; those who let the paste go cold tend to see the greys peek back through. It is not the plant that fails, it is the method that was rushed.

Copper — our customers' results

Copper is the shade plant-based colour was practically born to do. Because botanical pigments pull warm, copper comes out vivid, luminous and genuinely hard to replicate with chemistry without it looking brassy. The after photos glow. On greys, copper gives a bright, modern result rather than a flat block of orange, because the underlying tones show through.

If you have always been told that home colour looks dull, copper is the shade that changes minds. It is the most flattering proof that warm is a feature, not a fault.

Deep Black — our customers' results

Deep black is the most demanding shade and the most impressive when it lands. Full, true black with a soft shine, covering greys completely. The before-and-after contrast is striking precisely because black shows every missed patch, so there is nowhere to hide a sloppy application.

This is the shade that rewards patience the most. Black is built in two passes of pigment, so the two-step Method is non-negotiable. Customers who follow the timing and the temperature get a deep, even black; those who shortcut it can end up with a slightly green or uneven cast as the indigo settles. Done properly, the result is the kind of black that looks like it came out of a salon chair.

Blonde — our customers' results

We have to be straight with you about blonde, because this is where most disappointment with plant-based colour comes from, and almost always because of a false promise made elsewhere. Botanical colour cannot lighten hair. It cannot take a brown head and make it blonde. Nothing botanical lifts; only chemical bleach does that, full stop.

What our blonde shade does do is enrich and warm already-light or fair hair, adding golden, honeyed tones and a healthy shine, and toning down brassiness. The before-and-after photos from blonde customers show fair hair gaining warmth and gloss, never dark hair turning light. If you are dark and dreaming of going blonde at home, we would rather lose the sale than mislead you: that is a job for a colourist with bleach, not for plants.

Why it works: the two-step Method

Look across all of these results and the pattern is obvious. The shades people are happiest with are the ones where they followed the Method. This is the part the rest of the market tends to skip or explain badly, which is why so many people conclude that plant-based hair colour simply does not work. It does. The preparation is just usually missing.

Our co-founder Jung Ae built the Method around a simple insight: the hair has to be prepared before it can take the colour, and the colour has to be at the right temperature to release its pigments. So the box gives you two sachets, not one. The first prepares and conditions the fibre. The second is the colour itself. And a thermometer comes in the box so you are never guessing whether your paste is warm enough.

• Step one opens and conditions the hair fibre so the pigment has a surface to bind to.
• Step two applies the colour at the correct, thermometer-checked temperature for an even, lasting result.
• The thermometer removes the single biggest variable that causes home results to fail.

We did not invent henna, indigo, cassia or amla. They have coloured hair for centuries. What we improved is the experience and the reliability around them, so that the salon result is actually repeatable in your own bathroom. The formula is COSMOS Organic, made in France, free from ammonia, PPD, resorcinol and oxidant, gentle enough for sensitive scalps, and it sheaths and strengthens the hair as it colours. It won the Natexbio Challenge in 2024. None of that matters, though, if the application goes wrong, which is exactly why the Method exists.

"But what if I get it wrong?"

This is the fear that keeps people in the chemical aisle, so let us answer it plainly. Plant-based colour is genuinely forgiving, which is one of its quiet advantages. Because it deposits rather than strips, it does not damage the hair if you leave it on a little long, and it does not create a harsh line of demarcation as it grows out. If your first attempt is lighter than you hoped, you can simply colour again to deepen it. The pigment builds.

The mistakes that do happen are almost always the same two: skipping the preparation step, or letting the paste go cold. Both are solved by the box itself. Follow the two steps, check the temperature, and you are doing exactly what produced every after photo above.

Frequently asked questions

How long does plant-based hair colour last?

It fades gradually rather than washing out abruptly or leaving a hard root line, so it ages far more gracefully than chemical colour. Most people refresh every four to six weeks, and because the pigment builds with each application, the colour tends to look richer over time rather than more damaged.

Does it really cover grey hair?

On the darker shades, yes, our customers regularly achieve close to 100% grey coverage at home. The lighter and warmer shades cover greys too, but they will read as a luminous warm tone rather than an opaque block, which most people prefer anyway. Coverage is most reliable when you follow the two-step Method.

Can plant-based colour lighten my hair?

No, and anyone who tells you otherwise is not being honest. Botanical pigments only deposit colour, they never lift it. You can go darker, warmer, redder or cover greys, but you cannot go lighter or achieve a cool, ashy blonde with plants. Lightening requires chemical bleach.

Is it safe for a sensitive scalp?

It is formulated with sensitive scalps in mind, with no ammonia, no PPD, no resorcinol and no oxidant, the ingredients most often behind irritation and reactions to conventional dye. As with any cosmetic, we recommend a patch test before your first full application.

Why did plant-based colour not work for me before?

In our experience it is almost always the preparation. Most products on the market either leave out the step that conditions the fibre first or explain it poorly, so the colour has nothing to bind to and the result looks weak. The two-step Method, with the thermometer in the box, is built specifically to remove that failure point.