Science
Mechanism of Action
This ingredient functions solely as a colorant by superfically tinting the product bulk. As an iron coordination complex, it lacks any biological mechanism of action or benefit on human skin tissue.
Research
Clinical Evidence
Low confidenceN/A
Key findings
- 01 Clinical studies confirm Acid Green 1's role as a colorant, with no evidence for direct skin health benefits.
Transparency
Dusting Analysis
The Formula
Formulation
Stability
The dye is stable in alkaline conditions (native pH ~9.3) but is highly photolabile and sensitive to long-term storage, which can cause fading. It shifts to brownish-yellow in acidic environments.
Conflicts
- Strong oxidizing agents
- Strong reducing agents
- Strong acids (causes color shift to yellow/brown)
- Light (UV exposure)
Safety
Safety Profile
Formerly Ext. D&C Green No. 1, it's restricted in the U.S. but permitted in the EU and other regions as CI 10020 for rinse-off and non-mucosal products. Some jurisdictions prohibit its use in hair dyes.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Acid Green 1 is a safe and well-tolerated cosmetic colorant, effectively providing visual appeal without contributing active benefits to skin health.
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Similar Ingredients
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References
Sources