Science
Mechanism of Action
This dye functions via electrostatic interactions, with negatively charged sulfonate groups binding to positively charged amino groups in skin proteins like keratin. It remains on the external skin surface, without penetrating deep epidermal layers or influencing cellular pathways for skin improvement.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Clinical safety evaluation noted potential irritancy and high staining power, with no specific efficacy results for human skin improvement.
- 02 Textile-based studies established 1% concentrations for high-intensity red shading, indicating industrial usage levels for color fastness.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Highly stable in acidic conditions, but stability decreases in strong alkaline environments leading to potential precipitation. It is sensitive to copper and iron ions, which can cause color darkening.
Conflicts
- Strong oxidizing agents
- Strong reducing agents
- Cationic surfactants
- Copper ions
- Iron ions
Safety
Safety Profile
While CIR has not specifically reviewed Acid Red 73, its synonym 'Ext. D&C Red No. 13' is regulated by the FDA. It is prohibited in the EU and some other regions for use in hair dyes due to concerns over potential harmful aromatic amine release.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Acid Red 73 serves purely as a surface colorant with no active skincare benefits, and carries regulatory concerns in certain regions for specific applications, making its inclusion in precision skincare questionable.
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References
Sources