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Colorant

FLUORESCENT BRIGHTENER 393

CAS 1533-45-5 Updated
50

Safety score · 0–100

Moderate

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

About

A stilbene-based optical brightener (4,4'-bis(2-benzoxazolyl)stilbene). Makes formulations look whiter/brighter. Listed as skin/eye irritant by ECHA — used in low %.

Function

COLORANT

Skin benefits

  • Optical brightener — masks yellow tones
  • Used in nail/hair products
  • Aesthetic enhancer

Known concerns

  • Skin and eye irritant (H315/H319)
  • Respiratory irritant (H335)
  • Toxic to aquatic life (H411)
  • Stilbene class — limited cosmetic safety data

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.