Skip to content

Azo dye (non-cosmetic)

Disodium 4-hydroxy-3-[(4-sulphonatonaphthyl)azo]naphthalenesulphonate

CAS 3567-69-9
32

Safety score · 0–100

Caution

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

A disodium naphthalene sulphonate azo dye used as an industrial red colorant. It is not part of the EU positive list of cosmetic colorants, and the azo class can release aromatic amines, so it should not be used on skin.

Skin benefits

  • Provides strong red coloration in industrial dye applications
  • Water-soluble naphthalene azo dye

Known concerns

  • Sulphonated naphthalene azo dye not on EU Annex IV positive list for cosmetics
  • Azo class can liberate aromatic amines under reductive conditions
  • No SCCS safety opinion supporting cosmetic use
  • Risk of skin and eye irritation typical of azo dye class

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

Check your shelf

Find Disodium 4-hydroxy-3-[(4-sulphonatonaphthyl)azo]naphthalenesulphonate in your products.

Scan any cosmetic product with LuxSense to see if it contains Disodium 4-hydroxy-3-[(4-sulphonatonaphthyl)azo]naphthalenesulphonate and get a full ingredient breakdown with safety scores.

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.