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Colorant

HC BLUE NO. 11

CAS 23920-15-2
35

Safety score · 0–100

Caution

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

A direct (semi-permanent) blue hair dye. Like other HC dyes, it can sensitise the scalp and faces EU restrictions due to nitroaromatic amine concerns.

Function

HAIR DYEING

Skin benefits

  • Direct hair dye for blue/teal shades
  • No oxidative chemistry needed
  • Effective at low percentages

Known concerns

  • Hair dye sensitisation potential
  • SCCS reviews flag concerns for nitro/aromatic amine class
  • Restricted use levels in EU
  • Possible mutagenic precursors

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.