Hair dye
Hydroxyethyl-3,4-methylenedioxyaniline and its hydrochloride
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
An oxidative hair colour precursor used in permanent dyes up to 1.5% on the head. EU regulators classed it as safe at that limit but it is a known skin sensitiser, so a patch test is required.
Skin benefits
- Effective oxidative hair dye precursor for permanent colour
- SCCS-evaluated and CIR-reviewed with defined safe-use ceiling
- Permitted in EU rinse-off hair dye at maximum on-head 1.5%
Known concerns
- Strong skin sensitiser, patch test required before each use
- Must not be used where N-nitroso compounds can form
- Hair-dye use only, not for skin or body products
- Aromatic amine class with allergy potential on broken scalp
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
Related hair dyes
Same plant / compound family
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.