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Colorant

4-FORMYL-1-METHYLQUINOLINIUM-P-TOLUENESULFONATE

CAS 223398-02-5
38

Safety score · 0–100

Caution

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

A reactive quinolinium salt used as a hair-dye intermediate. Hair-dye intermediates carry known sensitization risk and limited cosmetic safety review.

Function

HAIR DYEING

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

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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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.