Science
Mechanism of Action
Functions as a dye coupler that diffuses into hair follicles and reacts with hydrogen peroxide to form larger aza dye molecules that become trapped within the hair structure, creating permanent coloration
Research
Clinical Evidence
High confidence0.5%
Key findings
- 01 SCCS Opinion 2006 demonstrated safety at 0.5% concentration in oxidative hair dye formulations
- 02 Journal of American College of Toxicology 1992 showed high sensitization potential at 3.0% in guinea pig studies
- 03 CIR Safety Assessment 2024 confirmed non-irritating properties at 2.5% concentration
Transparency
Dusting Analysis
Not applicable to skincare dusting as this ingredient is exclusively used in hair dye formulations, not facial skincare products
The Formula
Formulation
Stability
Sulfate salt form provides enhanced stability compared to free base. Requires protection from air exposure to prevent oxidative degradation and discoloration. pH neutralization to 6-7 range optimizes stability.
Synergies
- hydrogen peroxide
- other hair dye couplers
Conflicts
- Strong oxidizing agents
- Strong acids
- Iron and metal ions
Safety
Safety Profile
CIR Panel confirms safety for hair dye applications in non-sensitized individuals at ≤0.5%. Known skin sensitizer with high allergenic potential. Insufficient safety data for airbrush delivery methods.
Your Skin
Skin Compatibility
Our Assessment
Verdict
High sensitization risk and restriction to hair-only applications make this ingredient unsuitable for precision skincare formulations.
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References
Sources