Science
Mechanism of Action
This direct-acting dye adsorbs onto and diffuses into keratin fibers via ionic and van der Waals interactions. Its efficacy as a skin or hair colorant relies on direct binding to proteins.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Highly stable in aqueous solutions, its deposition on keratin is pH-dependent. Optimal binding occurs at slightly acidic pH (3-5) where keratin is positively charged.
Conflicts
- Cationic surfactants (e.g., Cetrimonium Chloride)
- Cationic polymers (e.g., Polyquaternium-7)
- Strong oxidizing agents
Safety
Safety Profile
While not reviewed by CIR, it is listed in the EU CosIng database. Similar acid dyes are typically restricted to 2.0% maximum in cosmetics to minimize sensitization.
Your Skin
Skin Compatibility
Our Assessment
Verdict
An optional ingredient primarily functioning as a direct colorant for skin and hair, best utilized for aesthetic purposes.
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