FAQ

Plant-based hair color is a natural and healthy alternative to conventional chemical dye. Pigments derived from tinctorial plants coat the hair shaft without opening the cuticles, without penetrating the cortex or entering the bloodstream. Hair is not weakened — on the contrary, each application strengthens and protects it.

Plant-based hair color visibly improves hair health: density, shine and resilience increase with repeated use. The tinctorial plants selected for Tresse have well-established pigmentary properties and recognised hair-care benefits.

Tresse plant-based hair color is 100% certified organic (COSMOS Organic) and contains no endocrine disruptors, no PPD, no resorcinol, no chemical oxidants, no heavy metals, no metallic salts and no synthetic colour boosters. It is the natural choice for colouring your hair while respecting both your health and the environment.

Tresse plant-based hair color coats the hair cuticles without breaking them, unlike oxidative chemical dye, which uses alkaline agents to open the cuticles, penetrate the shaft and enter the bloodstream. Repeated chemical treatments weaken the fibre, making it brittle and porous.

Plant-based color acts on the surface: pigments from tinctorial plants envelop the cuticles and seal them without altering the structure. Each application is also a nourishing treatment that reinforces the hair fibre. It contains no PPD, no resorcinol, no ammonia — the main causes of allergic reactions and hair damage linked to chemical dye.

One practical distinction: plant-based hair color cannot lighten hair, unlike chemical oxidation. It intensifies and tones without erasing natural colour. If you are looking for a shade lift, a chemical pre-lightening step would be required first.

Tresse plant-based hair color blends with your natural hair colour and protects the hair fibre. We recommend choosing the shade closest to your natural colour, or one tone above for a more defined result.

Our range offers six shades from luminous blonde to intense black, including hazelnut, deep chestnut, light chestnut and espresso. Each shade is formulated to deliver beautiful natural highlights and cover grey hair without an artificial, helmet-like effect. Since the formula contains no chemical oxidants, it cannot lighten — it tones, intensifies and seals the hair fibre.

If your hair has been chemically treated (highlights, bleaching, perms), perform a strand test first. If you are unsure, send us a photo at [email protected]: our team will guide you towards the most suitable shade for your hair profile.

Yes, Tresse plant-based hair color covers grey hair naturally, without an artificial, uniform look. Unlike chemical dye, which homogenises colour evenly, our plant-based formula blends grey hair into the chosen shade for a gradual, natural result.

Grey hair is particularly receptive to plant pigments because it lacks melanin and absorbs more colour. Coverage is complete and integrates harmoniously with naturally coloured strands, without sharp demarcation or artificial effect.

For optimal coverage, respect the recommended processing time for your chosen shade. If you have more than 30% grey hair, consider our Two-Step method (Base + Colour) for a more intense and even result. The final colour is visible 48 hours after rinsing, once the plant pigments have oxidised on contact with air. Grey hair often develops beautiful, rich-looking tones with plant-based colour.

Tresse plant-based hair color is permanent: once the plant pigments are fixed to the hair fibre, the colour does not wash out with a single shampoo. It is long-lasting — this is the very nature of the tinctorial plants we use.

Like any permanent colour, it fades gradually over time, with repeated washing and sun exposure. A slight natural lightening occurs over the weeks. Expect 6 to 9 weeks before visible fading — which contributes to the natural look of plant-based colour, far from the artificial effect of chemical dye.

To preserve intensity, use gentle colour-safe shampoos without harsh sulphates and avoid products containing silicones. A root touch-up can be performed as soon as regrowth is visible, without any risk of over-pigmentation on previously coloured lengths. Plant-based color darkens slightly in the 48 hours after application as pigments oxidise.

We have formulated our products with the aim of achieving 100% organic certification, and we have worked extensively on chroma and color rendering in order to offer natural shades, with an impact-based approach and a French manufacturing chain.

Of course, if the previous coloring was an oxidation coloring. If in doubt, send us a message and a picture to [email protected]

Yes, Tresse plant-based hair color is fully suitable for pregnant and nursing women. This is one of the main reasons why many women turn to plant-based hair color during pregnancy.

Our formula contains no endocrine disruptors, no chemical oxidants, no PPD, no resorcinol, no heavy metals and no ammonia-based agents. The plant pigments derived from tinctorial plants do not open the cuticles and do not penetrate the bloodstream, unlike oxidative chemical dyes.

Our range is certified COSMOS Organic and contains neither essential oils nor regulated allergens. The complete INCI list is available on each product page on our website. We are available at [email protected] for any questions about the formula before or during your pregnancy. Each ingredient has been verified and validated by an independent certification body as part of our COSMOS Organic commitment.

No, Tresse plant-based hair color contains neither essential oils nor allergens listed under European cosmetics regulations.

Our formula was developed with COSMOS Organic certification as a target, which sets strict requirements for every ingredient — all verified and validated by independent certification bodies. Essential oils, although natural, can be irritating to the scalp or trigger allergic reactions; we excluded them to ensure the best possible tolerance, especially for pregnant women and those with sensitive skin.

Our hair color does not contain the 26 regulated allergens identified by the European cosmetics directive, nor PPD (para-phenylenediamine), nor resorcinol, nor ammonia or its derivatives. The complete INCI list is available on each product page. In the case of known skin hypersensitivity, we recommend performing a strand test before the first application. Our formula is regularly audited by independent laboratories to ensure full compliance.