Science
Mechanism of Action
Functions as a reactive intermediate that penetrates the hair shaft and couples with primary oxidative dye molecules in the presence of hydrogen peroxide to create stable, large-molecular-weight pigments that become trapped within the hair cortex structure.
Research
Clinical Evidence
High confidence1.5%
Key findings
- 01 Percutaneous absorption study showing 0.211% systemic availability at 1.5% concentration
- 02 Human patch testing on 902 dermatitis patients revealed 1.4% allergic reaction rate at 2.0%
- 03 OECD TG 404 rabbit studies at 3.0% showed only transient mild irritation resolving within 7 days
Transparency
Dusting Analysis
Exclusively used in hair dye applications with strict regulatory limits; not applicable for skincare dusting analysis
The Formula
Formulation
Stability
Exhibits high stability in alkaline conditions required for oxidative hair dye chemistry; sulfate salt form enhances water solubility and stability compared to free base
Synergies
- p-phenylenediamine
- hydrogen peroxide
- alkaline buffers
Conflicts
- N-nitrosating agents
- strong oxidizing agents
- acidic formulations
Safety
Safety Profile
Approved for hair dye use up to 1.5% in final application mixture; strictly prohibited with N-nitrosating agents due to nitrosamine formation risk; EU Annex III restricted
Your Skin
Skin Compatibility
Our Assessment
Verdict
Specialized hair dye ingredient with no established skincare benefits and regulatory restrictions limiting broader cosmetic applications.
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