Back to Ingredient Dictionary

CI 42051

Description

CI 42051, also known as Patent Blue V, is a synthetic blue dye commonly used in cosmetic and skincare formulations. This water-soluble colorant belongs to the triarylmethane class of dyes and is characterized by its intense blue hue. In skincare products, CI 42051 is primarily utilized for its coloring properties, helping to create visually appealing formulations.

The dye is approved for use in various cosmetic applications within the European Union and other regions, although restrictions may apply depending on the specific product type and usage area. CI 42051 is often found in rinse-off products such as shampoos, shower gels, and facial cleansers, as well as in some leave-on formulations like lotions and creams.

While generally considered safe for topical use, some individuals may experience skin sensitization or allergic reactions to this colorant. As with any synthetic dye, patch testing is recommended for those with sensitive skin or a history of allergic reactions. It's important to note that CI 42051 serves a purely aesthetic function in skincare formulations and does not provide any direct skincare benefits or therapeutic effects.