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2-[(4-Aminophenyl)azo]-1,3- dimethyl-1H-imidazolium chloride

CAS 97404-02-9
28

Safety score · 0–100

Caution

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

About

2-[(4-Aminophenyl)azo]-1,3- dimethyl-1H-imidazolium chloride is a cosmetic ingredient used in product formulation. Exercise caution due to limited available safety data.

This imidazolium-based azo dye carries extensive EU GHS hazard classifications covering acute oral, dermal, and inhalation toxicity (H302, H312, H332), skin sensitisation (H317), serious eye damage (H318), and aquatic toxicity (H411). The EU CosIng database records a maximum concentration limit of 1.0% for this ingredient. Its cationic charge enables strong binding to keratin in hair and skin, making it effective as a semi-permanent dye, but the hazard profile necessitates careful formulation controls.

Skin benefits

  • Provides red and orange tones in hair dye formulations
  • Strong substantivity for semi-permanent coloration

Known concerns

  • H302/H312/H332: Acute toxicity via oral, dermal, and inhalation routes
  • H317: May cause allergic skin reaction
  • H318: Causes serious eye damage
  • H411: Toxic to aquatic life with long-lasting effects
  • EU CosIng maximum concentration 1.0%

References

EU

EU CosIng database

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

Check your shelf

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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.