Science
Mechanism of Action
As a functional colorant, CI 42170 imparts specific color to cosmetic formulations, and subsequently to skin, nails, or hair, through the selective absorption or reflection of physical light wavelengths.
Research
Clinical Evidence
Insufficient-data confidenceN/A
Transparency
Dusting Analysis
CI 42170 functions purely as a colorant and is not an active ingredient subject to 'dusting' considerations for efficacy or marketing claims related to skin benefits.
The Formula
Formulation
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel has not published an explicit review for CI 42170. European regulations (EC No. 1223/2009) authorize this colorant exclusively for rinse-off cosmetic products, with specific maximum concentrations and application areas potentially defined within Annex IV. While the FDA regulates color additives in the US, requiring batch certification for many synthetic organic colorants, a precise FDA status for CI 42170 (Acid Yellow 17) was not found in the available research.
Your Skin
Skin Compatibility
Our Assessment
Verdict
This colorant serves an optional aesthetic function, strictly for rinse-off formulations as mandated by European regulations, with current data providing insufficient insight into its direct skin compatibility or irritancy.
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References
Sources