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Active Ingredient

POTASSIUM SULFIDE

CAS 1312-73-8 / 37248-34-3 Updated
22

Safety score · 0–100

Caution

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

About

An alkaline sulfide used historically in chemical depilatories to dissolve hair keratin. Highly caustic and capable of releasing toxic hydrogen sulfide; EU restricts it to specific hair-removal applications with caps.

Function

DEPILATORY

Skin benefits

  • Effective keratin-dissolving action for depilatories
  • Long historical use in hair-removal products

Known concerns

  • Highly alkaline — chemical burn risk
  • Releases foul-smelling, toxic hydrogen sulfide on contact with acids
  • EU restricts to depilatory use within concentration caps
  • Skin and eye irritation hazards

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.