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Hair Dye

BIS-HYDROXYETHYL/PPG-7/PEG-4 DICYANOMETHYLTHIOPHENE AZOTOLUIDINE

CAS 515857-23-5 Updated
55

Safety score · 0–100

Moderate

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

About

A heterocyclic azo dye intermediate used in oxidative hair-coloring systems — penetrates the hair shaft to produce permanent colour. Carries the sensitisation and toluidine-class concerns common to permanent dyes.

Function

COLORANTHAIR DYEING

Skin benefits

  • Permanent oxidative hair colour
  • Good colour fastness
  • Compatible with standard developers

Known concerns

  • Skin sensitisation risk typical of azo hair dyes
  • Toluidine-derived intermediate raises long-term safety questions
  • Use restricted in EU under hair-dye regulations
  • Possible trace impurities from synthesis

References

EU

EU CosIng database

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

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ISATIN
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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.