Science
Mechanism of Action
Acts as a secondary intermediate in oxidative hair dye chemistry, reacting with primary intermediates like p-phenylenediamine under alkaline conditions to create large chromophore molecules that deposit color permanently in hair
Research
Clinical Evidence
High confidence2%
Key findings
- 01 SCCS safety evaluation confirmed appropriate use as hair dye coupler at maximum 2.0% concentration with hydrogen peroxide systems
Transparency
Dusting Analysis
This ingredient is exclusively used in hair coloring applications and is not applicable to general skincare formulations
The Formula
Formulation
Stability
Exhibits high air sensitivity requiring storage as hydrochloride salt form; demands alkaline environment for optimal coupling reactions and operational stability
Synergies
- hydrogen peroxide
- p-phenylenediamine
- alkaline activators
Conflicts
- oxidizing agents (pre-use)
- nitrosating agents
- strong acids
- halogenated organics
Safety
Safety Profile
SCCS 2024 opinion validates 2% maximum on-head concentration; presents moderate skin sensitization potential and possible eye irritation
Your Skin
Skin Compatibility
Our Assessment
Verdict
Specialized hair dye ingredient with no established skincare applications or benefits for facial skin treatment.
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References
Sources