Science
Mechanism of Action
This aluminum lake is an insoluble pigment providing coloration via dispersion on the skin or hair surface. Unlike its dye counterpart, it does not penetrate, ensuring stable color reflection.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Rabbit dermal and ocular irritation studies at 3.0% showed no significant clinical signs, suggesting a low irritant potential.
- 02 Human photopatch tests at 5.0% indicated general tolerance, though a slight sensitizing capacity in some individuals could not be entirely excluded.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
Insoluble in water and most organic solvents, requiring pre-dispersion in a medium like glycerin or castor oil. It demonstrates enhanced stability to light and heat compared to its water-soluble dye form.
Conflicts
- Strong oxidizing agents
- Strong reducing agents
- Strong acids or alkalis (may cause color bleeding or hue change)
Safety
Safety Profile
The FDA permanently lists FD&C Yellow No. 5 and its aluminum lakes for general cosmetic use, including the eye area. The SCCS limits its concentration to 0.5% when used specifically as a direct hair dye.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Valuable as a stable, low-irritancy yellow colorant for a broad range of cosmetic applications due to its non-penetrating nature and regulatory approval.
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References
Sources