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Plant-Based Hair Colour on Regrowth: How to Handle Difficult Roots
Plant-Based Hair Colour on Regrowth: How to Blend Roots Successfully
Managing regrowth with plant-based hair colour requires a slightly different approach than all-over application. The good news: with the right technique, you can achieve a seamless blend without a visible root line.
To understand the overall logic of plant-based colour, also consult: Plant-based colour: definition, advantages and Base + Colour method.
1. Why Roots Are Challenging with Plant Colour
New regrowth is virgin hair — its cuticle is intact and ready to absorb colour. The rest of the hair has already been coloured (with accumulated tannins). This difference in porosity means the same paste can produce slightly different results at the root versus the length.
Add to this the contrast effect: if you use a dark shade and your roots are very white, the demarcation line can be sharp and visible. The solution is not to change your shade — it is to adapt the method.
2. Identifying Your Type of Regrowth
The approach depends on your specific situation:
- Visible white hair at the root: 2-step protocol is needed for even coverage.
- Roots lighter than the lengths: risk of warm tone if the paste is not well-balanced.
- Roots darker than the lengths: colour can adhere differently — watch the porosity difference.
- Strong contrast after chemical colouring: longer transition period is required.
3. The 2-Step Method for White Roots
The best technique for white regrowth remains the 2-step plant-based colour method. The Base is applied specifically to the roots first (30–45 minutes), acting as a primer that opens the cuticle slightly. The Colour (step 2) is then applied over the entire length and unifies the result.
Result: perfectly even coverage, including on the most resistant regrowth zones.
4. Application Technique for Roots
- Work in fine sections — this ensures even coverage without missing patches.
- Apply a generous, thick paste at the root (a runny paste will slide off virgin hair).
- Extend the processing time slightly at the roots compared to the lengths.
- Do not pull the colour down the lengths at every touch-up — this causes progressive darkening of already-coloured sections.
- Apply from roots toward ends. Using a brush rather than your hands gives better precision on regrowth zones.
5. Choosing the Right Tresse Paris Shade for Your Regrowth
- Light roots: prefer balanced shades like Noisette or Châtain Profond.
- Dark roots: choose Espresso or Noir Intense for depth and coverage.
Full shade list: All Tresse Paris plant-based colour shades.
6. Products to Avoid Before Root Application
Certain hair products significantly reduce plant pigment adhesion at the regrowth zone. Avoid products containing silicones (dimethicone, cyclomethicone), mineral oils and styling waxes in the 72 hours before application. These substances form a film on the cuticle that prevents tannins from penetrating.
Instead, use light vegetable oil-based treatments (jojoba, argan) applied in small quantities on the lengths only — never on the roots before colouring.
7. Managing Tone Differences Between Roots and Lengths
If the roots appear differently coloured after application:
- Apply a thin additional layer on the zones that are too light.
- Reduce the processing time on the lengths to avoid over-saturation.
- Unify with a cooler shade (Espresso or Châtain Profond) applied lightly over the full length.
Some tone differences are temporary and even out after 1–2 shampoos as the colour oxidises. Use the SuperCare Mask to smooth the fibre and homogenise colour reflection.
Conclusion
With the right method and the right shade, even difficult regrowth can be perfectly managed. Plant-based colour offers durable, natural results with no harsh demarcation lines — as long as you treat roots and lengths as what they are: two different zones that sometimes need slightly different attention.
More advice: All our plant-based colour articles.
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