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Colorant

HC BROWN NO. 4

38

Safety score · 0–100

Caution

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

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

Function

COLORANT

Skin benefits

  • Provides brown 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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Same plant / compound family

10
HC BROWN NO. 1
Banned hair dye (aromatic amine)
 20
HC BROWN NO. 2
Prohibited hair dye
 65
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Hair Dye

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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.