Science
Mechanism of Action
As a cationic molecule, it binds to negatively charged keratinous surfaces to provide color. Biochemically, it functions as a UV absorber and a quencher of singlet oxygen and superoxide anions, protecting photosensitive active ingredients from oxidative degradation during sun exposure.
Research
Clinical Evidence
Low confidence5%
Key findings
- 01 Research indicates that at concentrations between 2-10%, this molecule effectively absorbs UV radiation (290–400 nm) and stabilizes other cosmetic actives by neutralizing reactive oxygen species.
Transparency
Dusting Analysis
In skincare, this ingredient is rarely used for its primary function. If present at very low levels (below 0.1%), it is likely used as a cosmetic colorant rather than for its patented photostabilizing benefits, which require much higher concentrations.
The Formula
Formulation
Stability
Highly soluble in ethanol and hot water; maintains stability in acidic to neutral environments. It undergoes decomposition into colorless forms or precipitates if the pH exceeds 8.5.
Synergies
- Photosensitive active ingredients
- UV filters
Conflicts
- Anionic surfactants (SLS/SLES)
- Strong oxidizing agents
- Copper ions
- Iron ions
- Strongly alkaline bases
Safety
Safety Profile
Prohibited for use in hair dyes within the European Union (Annex II). It is not FDA-certified for general cosmetic use and shows evidence of moderate toxicity and significant skin sensitization potential.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Despite its interesting photostabilizing properties, its high irritancy rating and regulatory prohibitions in major markets make it unsuitable for precision skincare.
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References
Sources