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Hair dye precursor

N,N-DIETHYLTOLUENE-2,5-DIAMINE HCL

CAS 2051-79-8
14

Safety score · 0–100

Avoid

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

A toluenediamine-class oxidative hair dye intermediate. Effective for color development but classified as a strong sensitizer with strict EU concentration limits and warning-label requirements.

Skin benefits

  • Provides oxidative color development in hair dye formulas
  • Yields a range of brown to black shades when combined with couplers

Known concerns

  • Toluenediamine-class compounds are potent skin sensitizers
  • SCCS-restricted with strict maximum concentrations in rinse-off hair dyes
  • Potential cross-reactivity with PPD allergy sufferers
  • Not permitted in eyelash or eyebrow dye 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.