Science
Mechanism of Action
Functions as a coupling agent in oxidative hair dye systems, reacting with primary intermediates under alkaline conditions in the presence of hydrogen peroxide to form large, permanent color molecules that become trapped within the hair shaft structure.
Research
Clinical Evidence
High confidence2%
Key findings
- 01 SCCS safety evaluation at 2.5% maximum concentration in oxidative hair dyes (SCCS/1224/09)
- 02 CIR Expert Panel assessment confirming safety in 0.005-2% range for hair coloring applications (2011 reaffirmation)
Transparency
Dusting Analysis
Not applicable for skincare formulations - this ingredient is specifically regulated for hair dye applications only
The Formula
Formulation
Stability
Demonstrates excellent stability under alkaline conditions but shows sensitivity to air oxidation, requiring specialized packaging and immediate pre-use mixing protocols
Synergies
- Primary hair dye intermediates
- Hydrogen peroxide oxidizing systems
Conflicts
- Strong oxidizing agents (premature activation)
- Acidic formulations (system destabilization)
Safety
Safety Profile
CIR assessment limited to hair dye formulations with specific concentration restrictions due to moderate skin sensitization potential
Your Skin
Skin Compatibility
Our Assessment
Verdict
A hair dye-specific ingredient with moderate sensitization risks that lacks established safety data for skincare applications.
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References
Sources