Colorant
4-FORMYL-1-METHYLQUINOLINIUM-P-TOLUENESULFONATE
Safety score · 0–100
Caution
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A reactive quinolinium salt used as a hair-dye intermediate. Hair-dye intermediates carry known sensitization risk and limited cosmetic safety review.
Function
Skin benefits
- Used as oxidative-hair-dye intermediate
- Provides catalytic role in some hair-dye systems
Known concerns
- Quaternary aromatic compound — possible skin sensitization
- Limited public safety dossier
- Hair-dye intermediates often face SCCS scrutiny
- Not a leave-on cosmetic ingredient
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related colorants
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.