Science
Mechanism of Action
Functions as a direct-acting colorant that penetrates the hair shaft structure without oxidative coupling requirements. Upon skin contact, undergoes rapid absorption and metabolic transformation via nitroreduction and acetylation pathways, converting to triaminobenzene and N4-acetyl derivatives.
Research
Clinical Evidence
High confidence1.1%
Key findings
- 01 Chronic 117-week topical study at 1.1% showed no tumor incidence increase
- 02 Skin penetration measured at 3.2 µg/cm² with 0.48% concentration
- 03 Primary Skin Irritation Index of 0 at 2.5% concentration in rabbits
Transparency
Dusting Analysis
Not applicable for skincare formulations as this ingredient is exclusively used in hair coloring products
The Formula
Formulation
Stability
Maintains stability in solid form but susceptible to oxidative degradation in solution with potential formation of reactive imine intermediates. Enhanced solubility observed in heated water and ethanol systems.
Conflicts
- Strong oxidizing agents
- Strong acids
- Iron (III) chloride
Safety
Safety Profile
CIR reaffirmed safety in 2003 for non-sensitized individuals but classified as potent skin sensitizer. Prohibited in EU (Annex II) while permitted in US and UK markets.
Your Skin
Skin Compatibility
Our Assessment
Verdict
While technically safe at regulated concentrations, its potent sensitization potential and hair-specific application make it unsuitable for precision skincare formulations.
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References
Sources