Science
Mechanism of Action
As a synthetic disazo yellow dye, Solvent Yellow 29 functions by selectively absorbing specific wavelengths of light and reflecting yellow light, thereby delivering a desired chromatic outcome to the product matrix rather than exerting a biological effect on the skin.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
This disazo dye exhibits sensitivity to both strong acids and strong bases, which can significantly alter its chromatic properties and solubility. For instance, exposure to concentrated sulfuric acid initially yields a red-orange hue, progressing to a yellow solution and then orange precipitation upon dilution. It demonstrates insolubility in solutions such as 10% sulfuric acid, concentrated hydrochloric acid, and 10% sodium hydroxide. Concentrated nitric acid exposure results in an initial orange coloration followed by fading.
Conflicts
- Strong acids (e.g., concentrated sulfuric acid, concentrated hydrochloric acid, concentrated nitric acid)
- Strong bases (e.g., 10% sodium hydroxide solution)
Safety
Safety Profile
Solvent Yellow 29 (CI 21230) is classified as a restricted cosmetic ingredient within the European Union (EU Cosmetics Regulation 1223/2009, entries IV/49, II/1352), strictly prohibited for use in hair dye products. The Cosmetic Ingredient Review (CIR) has not conducted a specific safety assessment for this compound. While the U.S. FDA mandates batch certification for color additives, a detailed approval or restriction status for Solvent Yellow 29 in general cosmetic applications is not specified. The Environmental Working Group (EWG) assigns an 'Unacceptable' rating, noting a 'HIGH' concern for developmental and reproductive toxicity, alongside a 'LOW' concern for allergies and immunotoxicity.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Given its classification as a restricted cosmetic ingredient in the EU, the absence of a CIR safety review, and particularly the Environmental Working Group's 'HIGH' rating for developmental and reproductive toxicity, Solvent Yellow 29 is not recommended for use in precision skincare formulations.
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References
Sources