Science
Mechanism of Action
As a cationic dye, it carries a positive charge that allows it to adhere to negatively charged surfaces like the hair shaft or microbial cell membranes. This ionic interaction disrupts the integrity of bacterial and fungal cell walls, while in cosmetic applications, it provides temporary surface-level color correction.
Research
Clinical Evidence
Low confidence0.5%
Key findings
- 01 Demonstrated efficacy against Gram-positive bacteria and Candida species, though modern clinical use is restricted.
- 02 Functions as a non-oxidative colorant for neutralizing yellow tones in hair care formulations.
Transparency
Dusting Analysis
This ingredient is not typical in skincare; its use is primarily confined to hair care and clinical antiseptics where precise concentrations are required to manage its high irritancy profile.
The Formula
Formulation
Stability
Maintains stability in highly acidic environments; however, it is prone to precipitation and a shift to a brownish-red hue when exposed to alkaline conditions (pH > 8.0).
Conflicts
- Strong oxidizing agents
- Strong reducing agents
- Strong acids
- Sodium hydroxide
Safety
Safety Profile
The CIR Expert Panel has flagged potential carcinogenic risks. It is strictly prohibited for use in cosmetics within the European Union and Canada.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Due to high irritancy and significant regulatory bans in major markets, this ingredient is not recommended for precision skincare.
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References
Sources