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Banned Substance

METHYLROSANILINIUM CHLORIDE

CAS -
10

Safety score · 0–100

Avoid

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

About

Crystal violet (gentian violet) — a triphenylmethane dye classified IARC Group 2B and banned from cosmetic hair-dye use in the EU.

Methylrosanilinium chloride, also known as gentian violet or crystal violet, is a triphenylmethane dye historically used as a topical antiseptic and textile dye. IARC has classified it in Group 2B — possibly carcinogenic to humans — based on evidence of rodent carcinogenicity and multiple positive genotoxicity assays. Under EU Regulation (EC) 1223/2009, crystal violet is prohibited in cosmetic products intended for use as hair dye (Annex II / Annex III entries for related triphenylmethane dyes). It remains a pharmaceutical drug in some jurisdictions but is not acceptable for modern cosmetic formulation. Score at the red/banned tier.

Function

HAIR DYEING

Skin benefits

  • Not applicable — banned from cosmetic hair dye use

Known concerns

  • IARC Group 2B carcinogen
  • EU Annex II prohibited for cosmetic hair dye use
  • Genotoxic signal in multiple assays
  • Strong sensitizer and stainer

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.