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Colorant

DIPHENYL NAPHTHOPYRAN

CAS 4222-20-2 Updated
40

Safety score · 0–100

Moderate

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

About

A photochromic naphthopyran dye — the kind used in self-tinting eyeglass lenses. It is a research/industrial material, not on the EU cosmetic colourant list. Off-label as a cosmetic ingredient.

Skin benefits

  • No established cosmetic benefit

Known concerns

  • Not on EU Annex IV cosmetic colourants
  • Designed for ophthalmic/industrial use
  • Limited cosmetic safety data
  • Off-label cosmetic use

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.