Science
Mechanism of Action
This ingredient functions primarily as a colorant, lending a yellow shade to products through light absorption and reflection. As a fluorescent dye, its conjugated system allows it to absorb blue light (465-490 nm) and subsequently re-emit this energy as bright green light (520-530 nm), a property utilized in various diagnostic and indicator applications.
Research
Clinical Evidence
High confidenceN/A
Key findings
- 01 Evaluated as safe for coloring contact lens solutions, demonstrating no irritant, sensitizing, or cytotoxic effects in comprehensive toxicity studies.
- 02 Generally well-tolerated on skin with no reported local or systemic adverse effects, though mild itch or pain has been noted with intradermal injections depending on preparation.
Transparency
Dusting Analysis
As a widely accepted and regulated cosmetic colorant with established safety, HC YELLOW NO. 8 is not typically associated with consumer 'dusting' or active ingredient avoidance.
The Formula
Formulation
Stability
Fluorescein Sodium is a hygroscopic solid sensitive to prolonged exposure to light and heat, which can lead to decomposition. It requires storage in a cool, dry, dark location, protected from moisture and UV radiation/sunlight.
Conflicts
- Strong oxidizers
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) affirms D&C Yellow No. 8 as 'safe as used'. The European Cosmetic Directive (EC) No 1223/2009 sanctions its use as a coloring agent across all cosmetic and personal care products, with a maximum concentration limit of 6% in the finished product.
Your Skin
Skin Compatibility
Our Assessment
Verdict
HC YELLOW NO. 8 is a safe and approved cosmetic colorant, providing vibrant yellow pigmentation and a unique fluorescent property, without notable skin compatibility concerns at approved concentrations up to 6%.
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