Skip to content

Colorant

ACID RED 51

CAS 16423-68-0; 1342-25-2 Updated
35

Safety score · 0–100

Caution

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

About

Erythrosine, a deep-pink iodinated dye. Approved for rinse-off cosmetics in the EU but banned from US food in 2025 over thyroid concerns at high exposure.

Function

COLORANTHAIR DYEING

Skin benefits

  • Bright pink/red dye
  • Approved cosmetic colorant in EU rinse-off
  • Used at very low levels

Known concerns

  • Iodinated xanthene dye — high iodine content
  • Thyroid concerns at high systemic exposure
  • Banned from US food in 2025
  • Possible photosensitiser

References

EU

EU CosIng database

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

Related colorants

35
1,3-Benzenediol, 4-Chlororesorcinol
Colorant
 35
2-AMINO-4-HYDROXYETHYLAMINOANISOLE
Colorant
 35
2-Amino-4,6-dinitrophenol and 2- amino-4,6-dinitrophenol, sodium salt
Colorant
 35
3-METHYLAMINO-4-NITROPHENOXYETHANOL
Colorant
 35
5-AMINO-4-FLUORO-2-METHYLPHENOL SULFATE
Colorant
 35
5-AMINO-6-CHLORO-O-CRESOL
Colorant
 35
6-AMINO-M-CRESOL
Colorant
 35
ACID BLACK 52
Colorant

Check your shelf

Find ACID RED 51 in your products.

Scan any cosmetic product with LuxSense to see if it contains ACID RED 51 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 — always read the physical product label and consult a healthcare professional for personal concerns.