Skip to content

Hair Dye

HC RED NO. 21

Updated
60

Safety score · 0–100

Fine

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

About

A nitroaromatic direct dye giving red tones in semi-permanent hair color. Not currently EU-restricted but shares the sensitization profile of the nitro hair dye class; patch testing is sensible.

Function

HAIR DYEING

Skin benefits

  • Provides red tones in semi-permanent hair color
  • Currently no specific EU Annex restriction listed
  • Useful in low-allergenic shade-development systems

Known concerns

  • Nitroaromatic amine class — known sensitization profile
  • Limited published genotoxicity data
  • Patch test recommended

References

EU

EU CosIng database

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

Related hair dyes

62
HC ORANGE NO. 7
Hair Dye
 55
1,2,4-BENZENETRIACETATE
Hair Dye
 55
6-METHOXY-2,3-PYRIDINEDIAMINE HCL
Hair Dye
 55
BIS-HYDROXYETHYL/PPG-7/PEG-4 DICYANOMETHYLTHIOPHENE AZOTOLUIDINE
Hair Dye
 55
DIHYDROXYINDOLINE HBR
Hair Dye
 65
HC BLUE NO. 20
Hair Dye
 65
HC BROWN NO. 3
Hair Dye
 55
HC ORANGE NO. 1
Hair Dye

Check your shelf

Find HC RED NO. 21 in your products.

Scan any cosmetic product with LuxSense to see if it contains HC RED NO. 21 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.