Science
Mechanism of Action
This synthetic organic triarylmethane dye functions by absorbing and reflecting specific wavelengths of light, thereby imparting a brilliant blue color directly to cosmetic products, as well as to skin, nails, and hair upon application.
Research
Clinical Evidence
High confidenceN/A
Transparency
Dusting Analysis
The Formula
Formulation
Stability
CI 42090 exhibits robust stability across a wide pH range of 2 to 11 and is notably tolerant to heat. It also demonstrates resistance to sunlight and water exposure, contributing to color longevity. For water-soluble dye formulations, the inclusion of a UV filter is recommended to mitigate potential fading caused by UV light.
Safety
Safety Profile
CI 42090, also known as Brilliant Blue FCF or FD&C Blue No. 1, holds FDA approval for use in food, pharmaceuticals, and cosmetics, including the sensitive eye area. It is additionally approved for use in all cosmetic products by European regulatory bodies (SCCNFP/SCCS). While generally considered safe for skin and hair, isolated instances of skin irritation and redness have been reported, particularly in individuals with dye allergies. A patch test is therefore advised for products containing this ingredient. Notably, moderate irritation was observed in 40 of 207 volunteers after a 48-hour occlusive application. It should be avoided in breathable products, such as perfumes, to prevent the risk of inhalation or consumption. An Acceptable Daily Intake (ADI) of 0-10 mg/kg bw/day has been established for its use as a food colorant.
Your Skin
Skin Compatibility
Our Assessment
Verdict
CI 42090 is a valuable synthetic blue colorant, widely approved and stable across diverse formulations, though a patch test is recommended for individuals with potential dye sensitivities.
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