Science
Mechanism of Action
Functioning as both a cosmetic pigment and a photoprotective agent, CI 77491 imparts red tones while actively safeguarding the skin. It attenuates high-energy visible light, specifically blue light within the 400 nm to 500 nm range, through a combination of absorption and reflection. This action helps to mitigate blue light-induced skin aging and hyperpigmentation, with an additional mild protective effect against UV radiation. Its inherent reflective properties also contribute to visually diffusing imperfections and promoting a more even skin tone.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Clinical studies demonstrate that formulations containing iron oxides, including CI 77491, provide significant protection against visible light-induced pigmentation in individuals with Fitzpatrick IV skin types. These formulations surpassed non-tinted mineral SPF 50+ sunscreens in preventing new pigmentation triggered by sunlight exposure and aiding in the masking of existing discoloration.
- 02 Research indicates that CI 77491 (red iron oxide) enhances protection against certain wavelengths of high-energy visible light. It specifically attenuates visible blue light, approximately between 400 nm and 500 nm, through both absorption and reflection mechanisms, thereby offering enhanced protection against skin damage.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
CI 77491 exhibits robust stability, demonstrating resistance to degradation from light, heat, acids, and alkalis. Optimal stability is observed within a pH range of 6.0 to 7.0. While it is insoluble in water and most organic solvents, it disperses effectively in fats and concentrated mineral acids, and is considered miscible in both water and oils for cosmetic formulation purposes.
Safety
Safety Profile
The Expert Panel for Cosmetic Ingredient Safety (CIR) defers to FDA assessment, deeming CI 77491 safe for use. The FDA approves it as a color additive, exempt from batch certification, for use in cosmetics—including the eye area—in quantities consistent with good manufacturing practices. Similarly, the EU's Scientific Committee on Consumer Safety (SCCS) permits its use as a colorant without restriction, provided purity requirements are met. It is considered non-allergenic and non-toxic, with strict regulatory purity standards enforced to limit potential contaminants. Typical application concentrations vary by product type: 0.2–10.0% in foundations, concealers, and BB/CC creams; 0.1–8.0% in blush, bronzer, and contour products; 0.5–20.0% in eyeshadows; and 0.05–5.0% in lipsticks and lip products.
Your Skin
Skin Compatibility
Our Assessment
Verdict
CI 77491 is a valuable ingredient, not only imparting cosmetic color but also providing proven protection against visible and blue light-induced hyperpigmentation and skin damage, making it suitable for all skin types.
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