Pro guide · Oxidants & developers · 9 min

Which oxidant should you use for eyebrow and eyelash dye? 1.8%, 3% or 6%, cream, gel or liquid

The dye tube catches the eye, but it’s the oxidant that determines the intensity, longevity, and client comfort. Here’s how to choose one based on the hair, the service, and the brand, with the exact ratios we use in the salon.

A dye that comes out too light on thick brows, another that turns too dark on freshly laminated brows, a mixture that runs into the client’s eye: in all three cases, the dye isn’t the problem. The oxidant was the wrong choice. Most professionals carefully choose their dye, then pick “the matching 3%” without giving it a second thought. Yet the result on the skin is completely different with a 1.8% cream than with a 3% gel.

This guide explains what the concentration really changes, what the texture changes, which combination we choose for each client, and what each brand offers: Bronsun, Zola, Noemi, RefectoCil, Thuya, OKO, Élan, BrowXenna, Brow Daddy, Buff Browz, Pink Flash, and Nikk Mole. All the products mentioned are in the Oxidants & Developers collection from Brow.X Professionnel.

01 - The role

What an oxidant really does in eyebrow and eyelash dye

An oxidant (also called a developer, activator, or oxidizing cream: four words for the same product) is an emulsion of hydrogen peroxide. Mixed with the dye, it does two things: it opens the hair cuticle slightly so the pigments can get inside, and triggers the reaction that “develops” the color, transforming the colorless precursors in the tube into visible pigment. Without it, oxidative dye won’t color anything.

The percentage indicates the amount of peroxide. You’ll also find it expressed in “volumes” on products from the hairdressing industry: 3% = 10 volumes, 6% = 20 volumes, and 1.8% corresponds to about 6 volumes. The higher the percentage, the faster the reaction and the quicker the pigment deposits on the hair - but the more the cuticle is stressed and the more the skin is exposed.

One thing to keep in mind for what follows: the percentage is not an intensity setting. With hybrid tint, the final color depends first on the shade selected, processing time and skin condition. Going from 3% to 6% to “darken” a result that’s too light only speeds up the reaction and damages the hair; the right move is to change the shade or leave it on for a few more minutes. We’ll discuss this again in the mistakes section, section 07.

02 — The concentrations

0%, 1.8%, 3% or 6%: which one for which hair?

A word about lashes: European cosmetics regulations govern hydrogen peroxide in products intended for lashes more strictly than in hair products, which is precisely why brands have introduced 1.8% and 2% options. If you tint lashes, this is the concentration we recommend; if you work with a 3% product, reduce the processing time and protect the lower eyelid. Our guide on choosing a brow and lash tint covers this in more detail.

03 — Textures

Cream, gel or liquid: the texture changes the result, not the chemistry

At the same percentage, two oxidants with different textures develop color in the same way. What changes is the consistency of the mixture, and therefore the precision of the outline, how well it stays in place during processing, and how the pigment settles on the skin. RefectoCil states this plainly for its two oxidants: same performance, with only the application comfort differing. We agree, with one nuance: on the skin, the difference is visible.

In practice: cream when you want a mixture that stays in place and a powdery result; it's the default choice. Gel when the client wants a made-up effect that lasts a week and you're outlining with a brush. Liquid when using a classic tint such as RefectoCil or Thuya on lashes, where the fluid consistency helps the mixture coat each lash down to the root. Be careful with liquid on the brows of a client lying down: the mixture must be thick enough not to run into the eye.

04 — Based on the client

Which oxidant should you choose for the treatment and hair type?

Here's the guide we use. It starts with the simple rule mentioned above: the tint creates the color, the oxidant controls the softness. We always start by choosing the percentage based on the condition of the hair, then choose the texture based on the desired result on the skin.

Normal to dense brows, client wants a noticeable result

The 3% cream from the same brand as your tint, mixed 1:1. This is the most common case, and the one the manufacturers' protocols and processing times are designed for. If the client asks for a "made-up" effect or a pronounced ombré, switch to the 3% gel with Noemi tint: the stain on the skin comes out sharper and denser.

Fine, light, or sparse brows

The 1.8% cream. Fine hairs take color very quickly; at 3%, blondes often end up a shade too dark, and the skin, which holds most of the color on a sparse brow, stains unevenly. The 1.8% slows everything down and gives you time to stop processing at the right moment. With a light shade like Bronsun No. 5 Light Brown or Zola Light Brown, this is the duo that keeps blondes from turning brunette.

Thick, coarse, or gray brows

Gray, coarse hair has a closed cuticle that lets in little pigment. Two options: stay at 3% and extend the processing time to the upper end of the manufacturer's range, applying two thin layers; or switch to Noemi 6%, designed exactly for this purpose, with Noemi tint. This is the only case where 6% is appropriate for tinting; it should be used neither on lashes nor on laminated hair.

Tinting after a brow lamination

Hair that comes out of the lamination lotion has an open cuticle and absorbs twice as fast. At 3% with the usual processing time, the result will be too dark and the hair sensitized. Switch to 1.8% (Zola, Bronsun) or dilute your 3% with Noemi 0%, and reduce the processing time. If you only have 3%, halve the processing time and check every two minutes. The Bronsun tint guide details the Nude Range, designed for this situation.

Lashes

A gentle concentration (1.8% or 2%) or, with classic tints such as RefectoCil and Thuya, the liquid oxidant specified by the brand and a short processing time. The texture must remain creamy: a mixture that's too runny can migrate under the eyelid when applied to closed lashes. Never go up to 6%, even for very light lashes that “won't take”: the solution is a deeper shade (blue-black rather than black), not more peroxide.

Reactive skin, sensitive client

1.8% cream, a thin layer, and a barrier (Zola Save Skin or a protective cream) around the area. The slower reaction generates less heat on the skin, and the softer result is generally better suited to clients who rarely ask for a makeup-like effect.

05 — Brand by brand

Which oxidant with which tint? Ratios and products

Each manufacturer calibrates its oxidant to its tint: consistency, pH, stabilizers, and development time all go together. Here are the combinations specified by the brands we distribute, with the ratio indicated by the manufacturer.

06 — Mixing brands

Can you use a developer from another brand, or a hair developer?

This is the question we get most often, usually on the day the bottle is empty and the client is already seated. Our in-salon answer: one dye, one developer. Not as a matter of commercial principle, but because the 1:1 ratio of a hybrid dye is calculated for the consistency and reactivity of a specific developer. With another one, the mixture comes out thinner or thicker, the color develops faster or slower, and the final shade may shift — a brown that turns reddish, a graphite that turns green. Several manufacturers (BrowXenna, Élan, OKO) also specify that their developer is intended only for use with their own system.

Low-volume hair developer is indeed 3%, but it is formulated for the scalp and hair lengths: its texture, stabilizers, and fragrance are completely different, and it has not been evaluated for use around the eyes. We don't use it, even as a backup. A 30 ml bottle costs between €7 and €20 here and lasts for dozens of applications: there are no savings, but there is a risk.

07 — The mistakes

The six developer mistakes that ruin a tint

08 — Integrated oxidant

What about ready-to-use tints, with the oxidant already in the tube?

Four products in the store require no mixing: Zola Tattoo Tint, Thuya Let's Go Dye, Pink Flash Hero Shades and Brow Daddy StainMe. One clarification, because the “oxidant-free” label can be confusing: these tints don't do without oxidant; the oxidant is already integrated into the formula, in a dose set by the manufacturer. Open the tube and apply. So there's no ratio to measure, no mixing cup, no bottle to add—and above all, no third-party oxidant “to boost” it: the mixture would be overdosed, and you'd lose precisely what these formulas offer: a short processing time and consistent results.

We choose them for a client in a hurry, a touch-up between two tinting sessions, brow mapping that needs to look sharp in minutes, or skin that doesn't tolerate a conventional mixture well. Their strength is also their limitation: the color works mainly on the skin and the surface of the hairs, so it lasts less time on the hairs than a mix-and-apply hybrid tint, and intensity is adjusted by processing time and number of layers rather than by choosing a percentage. For six-week wear on the hairs, a hybrid tint with its separate developer remains the benchmark — and now you know which one to choose.

09 — FAQ

FAQ — your questions about tint developers