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Colorant

HC VIOLET NO. 3

CAS 33500-43-5 Updated
38

Safety score · 0–100

Caution

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

About

A nitro-aromatic violet hair-dye colorant used in semi-permanent hair products. Restricted in the EU due to sensitization and nitrosamine-formation concerns.

Function

COLORANT

Skin benefits

  • Provides violet/blue tone in non-oxidative hair dyes
  • Used at low percentage in finished product

Known concerns

  • HC nitro hair dyes are a flagged class for sensitization
  • Potential nitrosamine formation if formulated with nitrosating agents
  • Restricted in EU Annex III with concentration cap
  • Avoid skin contact during application

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 — always read the physical product label and consult a healthcare professional for personal concerns.