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CI 77492.

Valuable CAS 51274-00-1 / 1345-27-3 / 20344-49-4 / 52357-70-7 / COLORANT

CI 77492, also known as Yellow Iron Oxide, is an inorganic pigment essential for imparting a vibrant yellow hue to cosmetic formulations. Beyond its role as a colorant, it contributes to skin protection by creating a physical barrier that attenuates specific light wavelengths.

Summary

Colorant Pigment Blue Light Filter

Science

Mechanism of Action

This ingredient primarily functions as a cosmetic colorant, bestowing a yellow pigment. On the skin, CI 77492 forms a protective physical barrier. This barrier is scientifically proven to attenuate high-energy visible (HEV) light, commonly known as blue light, across the 415-465 nm wavelength range. This mechanism aids in mitigating photoaging, hyperpigmentation, and melasma. Furthermore, it can impart a desirable matte finish in makeup products.

Research

Clinical Evidence

Medium confidence
Effective range N/A
Optimal

N/A

Key findings

  1. 01 In formulations containing a synergistic blend of zinc oxide, titanium dioxide, and various iron oxides (including CI 77492), a significant attenuation of 71.9%-85.6% of high-energy visible (blue) light was observed between 415-465 nm. This collective action provides robust protection against skin damage, photoaging, and addresses concerns such as melasma and hyperpigmentation.

Transparency

Dusting Analysis

Not commonly dusted

The Formula

Formulation

Solubility
Oil
Optimal pH 3.4 – 3.9
0 7 14

Stability

CI 77492 demonstrates exceptional chemical stability, resisting light, heat up to 300°C, and oxidation, which makes it ideal for long-lasting product integrity. While it is insoluble in both water and ethanol, it disperses effectively in oils and is described as miscible in both oils and water, facilitating its incorporation into diverse formulations. Its stability is not compromised by pH fluctuations.

Safety

Safety Profile

CIR Status
Deferred evaluation
Sensitization risk Low

The Expert Panel for Cosmetic Ingredient Safety (CIR) has deferred evaluation of iron oxides, acknowledging that the U.S. Food and Drug Administration (FDA) has already assessed their safety. The FDA lists iron oxides as certified safe color additives for cosmetics, including lip and eye products, provided they adhere to stringent heavy metal purity specifications. Synthetic iron oxides are preferred over natural sources due to their superior purity. In the European Union, CI 77492 is regulated as an allowed coloring agent in Annex IV, Part I, with no usage restrictions when purity requirements are met.

Your Skin

Skin Compatibility

Yes Normal
Yes Dry
Yes Oily
Yes Sensitive
Irritancy Low
Comedogenicity Low

Our Assessment

Verdict

Valuable

CI 77492 is a valuable ingredient, not only for precise cosmetic coloring but also for providing significant blue light protection, making it highly beneficial for comprehensive skin defense.

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