Science
Mechanism of Action
This water-soluble colorant ionizes to bind with positively charged skin components, imparting a red hue. In some specific applications, it can act as a photosensitizer, generating reactive oxygen species.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 SCCS assessed Acid Red 92 safety for oxidative hair dyes up to 2.0%, observing no skin irritation or sensitization in rabbit studies.
- 02 SCCNFP dermal irritation tests on rabbits confirmed Acid Red 92 as a non-irritant at 0.5g neat for 4 hours.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Highly water-soluble and stable in alkaline environments (pH 8.5-9.7), but precipitates in acidic conditions (< pH 4.0). Exhibits poor light resistance, leading to fading.
Conflicts
- Strong oxidizing agents
- Strong acids
- Cationic surfactants
Safety
Safety Profile
Approved by the FDA as D&C Red No. 28 for drugs and cosmetics (except eye area). EU SCCS deems it safe for hair dyes up to 2.0% (oxidative) and 0.4% (non-oxidative), with specific purity requirements.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Acid Red 92 is an optional cosmetic colorant, offering vibrant red pigmentation with a low irritation risk, though its medium comedogenicity and light sensitivity should be considered in precision skincare formulations.
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References
Sources