Science
Mechanism of Action
This ingredient functions by physically depositing green pigment onto surfaces, effectively coloring cosmetic formulations or biological tissues like skin, nails, and hair. It is classified as a synthetic triphenylmethane dye.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
As a colorant, the concept of 'dusting' related to insufficient active concentration does not apply to CI 42100.
The Formula
Formulation
Stability
The color integrity of CI 42100 is highly sensitive to pH variations. In the presence of strong sulfuric acid, it initially appears orange before transitioning to yellow upon dilution. While its aqueous solution is green, the introduction of sodium hydroxide shifts the color to olive green, followed by the formation of a dark brown precipitate.
Conflicts
- Strong acids
- Strong bases
Safety
Safety Profile
Regulatory status for CI 42100 (D&C Green No. 7) varies significantly. The U.S. FDA has delisted this colorant, rendering its use impermissible in drugs and cosmetics within the United States. Conversely, the SCCS/EU permits its use as a colorant in cosmetic products under the EC Cosmetics Regulation (Annex IV), specifically restricting its application to rinse-off cosmetics or products intended for brief skin contact.
Your Skin
Skin Compatibility
Our Assessment
Verdict
CI 42100 serves as a synthetic green colorant for cosmetics, but its regulatory prohibition in the United States and restricted use in the EU make its broad application questionable for precision skincare.
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References
Sources