Science
Mechanism of Action
Acts as a nucleophilic coupler that undergoes oxidative coupling reactions with primary intermediates in alkaline environments to generate large chromophore molecules that become trapped within hair fibers
Research
Clinical Evidence
High confidence2%
Key findings
- 01 SCCS safety evaluation demonstrating 2.0% maximum safe concentration for oxidative hair dyes
- 02 CIR assessment showing minimal eye irritation and slight skin irritation at 4.0% concentration
Transparency
Dusting Analysis
This ingredient is specialized for hair coloring applications and would not typically appear in skincare formulations where dusting practices are relevant
The Formula
Formulation
Stability
Requires alkaline conditions for activity and stability; highly susceptible to oxidation when exposed to air; dihydrochloride salt form enhances water solubility to approximately 425 g/L
Synergies
- Hydrogen peroxide
- Primary hair dye intermediates
Conflicts
- Strong oxidizing agents beyond intended reactions
- Acidic formulations that destabilize salt form
Safety
Safety Profile
Maximum 2.0% applies to final on-scalp concentration after mixing; typical sensitization potential associated with aromatic amine compounds
Your Skin
Skin Compatibility
Our Assessment
Verdict
A specialized hair coloring ingredient with no established skincare benefits and moderate sensitization potential.
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References
Sources