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Hair Dye

HC BLUE NO. 20

Updated
65

Safety score · 0–100

Fine

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

About

A direct hair dye providing blue tonality in semi-permanent color systems. No specific EU Annex restriction is currently listed; as an aromatic amine derivative a patch test is sensible before use.

Function

HAIR DYEING

Skin benefits

  • Provides blue tonality in semi-permanent hair color
  • No specific EU regulatory restrictions currently listed
  • Stable direct dye not requiring oxidative coupling

Known concerns

  • Aromatic amine class — possible sensitization
  • Limited published independent toxicology data
  • Patch test recommended

References

EU

EU CosIng database

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

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