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Colorant

ACID BLUE 1

CAS 129-17-9
60

Safety score · 0–100

Fine

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

A bright blue triphenylmethane dye (CI 42045) used in soaps and bath products. EU-permitted but with use restrictions; can sensitize a small share of users.

Function

HAIR DYEING

Skin benefits

  • Blue color in rinse-off products
  • EU-permitted with restrictions
  • Stable in formulation

Known concerns

  • Triphenylmethane dye — sensitization potential
  • Use restricted to non-mucosal applications in EU
  • Possible allergic contact dermatitis

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