Science
Mechanism of Action
This molecule operates through electrostatic attraction; its positive charge (cationic) binds to the negatively charged keratin proteins found in the stratum corneum and hair shaft. It functions as a surface colorant, adhering to the outermost layers with minimal percutaneous penetration into deeper dermal tissues.
Research
Clinical Evidence
High confidence1%
Key findings
- 01 SCCS/1334/10: Assessment of 1.0% concentration in non-oxidative dyes showing low absorption (0.2%) and safe topical profile.
- 02 SCCS/1358/10: Evaluation of 0.5% concentration in oxidative environments confirming no significant systemic toxicity.
Transparency
Dusting Analysis
As a potent synthetic dye, 'dusting' is rarely an issue because even minute amounts produce significant visual pigment. However, concentrations below 0.1% in a product marketed for 'color refreshing' may be insufficient for noticeable results.
The Formula
Formulation
Stability
Maintains peak stability between pH 4.0 and 7.0; prolonged exposure to environments exceeding pH 9.0 can lead to chemical degradation and loss of chromatic intensity.
Synergies
- Cationic conditioners
- Hydrogen peroxide (in oxidative systems)
Conflicts
- Anionic surfactants
- Strong reducing agents
- Strong oxidizing agents (outside of specific oxidative dye kits)
Safety
Safety Profile
Recognized as a potential skin sensitizer. In the EU, products containing this ingredient must alert consumers to the risk of allergic reactions.
Your Skin
Skin Compatibility
Our Assessment
Verdict
A safe and effective surface colorant for hair and specialized scalp applications, though it offers no biological skin benefits and requires caution for sensitive users.
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References
Sources