Science
Mechanism of Action
Functions as a secondary intermediate that reacts with primary dye precursors in the presence of hydrogen peroxide to form larger, stable color molecules within the hair shaft structure.
Research
Clinical Evidence
High confidence1.5%
Key findings
- 01 SCCS patch testing at 1.5% demonstrated sensitization potential, particularly in individuals pre-sensitized to p-phenylenediamine
- 02 CIR evaluation at 1.0% confirmed effective color coupling in oxidative hair dye systems
Transparency
Dusting Analysis
Not applicable for skincare formulations as this ingredient is exclusively designed for hair coloring applications
The Formula
Formulation
Stability
Requires oxygen-free storage conditions and alkaline pH environment; degrades rapidly upon air exposure
Synergies
- p-phenylenediamine (primary intermediate)
- hydrogen peroxide (oxidizing agent)
Conflicts
- Strong oxidizing agents
- Strong acids
- Air/oxygen exposure
Safety
Safety Profile
Classified as a skin sensitizer with particular concern for individuals already sensitized to related aromatic amines
Your Skin
Skin Compatibility
Our Assessment
Verdict
Exclusively a hair dye ingredient with sensitization risks and no skincare benefits.
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