Science
Mechanism of Action
CI 42045 operates by directly imparting color, thereby enhancing the visual appeal of cosmetic formulations and providing superficial tinting for skin and nails. It does not interact with biological pathways or deliver active skin benefits.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
CI 42045 is a colorant with a clearly defined role in product aesthetics, not a skin-benefiting active ingredient. Its function is transparent, and it is not subject to exaggerated efficacy claims.
The Formula
Formulation
Stability
As a water-soluble colorant, CI 42045 requires the inclusion of a UV filter (e.g., ActiveProtect™ UV) in formulations to mitigate potential color degradation and fading upon exposure to ultraviolet light.
Conflicts
- Formulators should exercise caution when incorporating CI 42045 into cream, lotion, gel, or serum bases without specialized 'EasyWash™ type' color considerations, as adherence to product surfaces may be compromised.
- Not recommended for use in makeup formulations.
- Restricted from use in products applied on or in the immediate vicinity of mucous membranes (e.g., lip and eye area).
- Forbidden from use in hair dye products.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) has not conducted a specific review of CI 42045. However, the FDA permits a maximum concentration of 5.00% for this colorant (also known as Acid Blue 1) in skin care products. The SCCS lists CI 42045 as an allowed colorant in Annex IV of the EC Cosmetics Regulation, with specific concentration limits for various uses. Its use is strictly prohibited in products for mucous membranes (lip and eye areas) and in hair dyes.
Your Skin
Skin Compatibility
Our Assessment
Verdict
CI 42045 is an optional cosmetic colorant that safely enhances product aesthetics within regulatory limits and specific usage restrictions, offering no direct skin benefits.
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References
Sources