Science
Mechanism of Action
Acts as a reactive coupler that undergoes oxidative coupling reactions with primary intermediates in the presence of hydrogen peroxide, forming large chromophoric molecules that deposit within the hair shaft structure.
Research
Clinical Evidence
High confidence1.5%
Key findings
- 01 Demonstrated 3.90% dermal absorption rate with hydrogen peroxide at 1.6% concentration
- 02 Achieved Margin of Safety value of 947 under oxidative conditions at 1.5% concentration
Transparency
Dusting Analysis
Specialized hair dyeing ingredient with established regulatory limits rather than cosmetic dusting concerns
The Formula
Formulation
Stability
Requires alkaline environment for optimal stability and function. Sensitive to atmospheric oxygen exposure, necessitating airtight storage. Often formulated as hydrochloride salt for enhanced shelf stability.
Synergies
- Hydrogen peroxide
- p-phenylenediamines
Conflicts
- Strong oxidizing agents
- Acidic compounds
- Oxygen exposure
Safety
Safety Profile
CIR Expert Panel 2023 re-evaluation confirms safety when used in oxidative hair dyes with maximum 1.5% final concentration. Classified as coal tar hair dye requiring specific labeling in US markets.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Specialized hair dyeing ingredient with established safety profile but limited to specific formulation applications under strict concentration controls.
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References
Sources