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Barium bis[4-[(2-hydroxy-1-naphthyl)azo]-2-methylbenzenesulphonate]

CAS 5850-87-3
28

Safety score · 0–100

Caution

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

A barium-based synthetic azo pigment used in cosmetic colourants; barium salts are subject to heavy-metal restrictions in the EU due to cardiac and neurological toxicity risk.

This compound is Pigment Red 51 (C.I. 15580), a barium-chelate azo dye. Barium salts are regulated under EU cosmetics regulation 1223/2009 due to their potential cardiac toxicity (barium ions affect potassium channels). While not currently on the prohibited Annex II list solely for being a barium salt, such metal-chelate colourants face growing regulatory scrutiny and are restricted or banned in several jurisdictions.

Known concerns

  • Barium ion toxicity — cardiac and neurological effects
  • Heavy metal residue restrictions in EU cosmetics
  • Not permitted in oral or mucous membrane products

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.