Back to Ingredient Dictionary

CI 42170

Description

CI 42170, also known as Green S or Food Green 4, is a synthetic triarylmethane dye commonly used in cosmetics and personal care products. This water-soluble colorant imparts a vibrant blue-green hue to various skincare formulations, including creams, lotions, and cleansers. Its molecular structure allows for excellent stability in a wide range of pH levels, making it versatile for different product types.

In skincare applications, CI 42170 is primarily utilized for its coloring properties rather than any specific skin benefits. It is approved for use in cosmetics by regulatory bodies in many countries, including the European Union and the United States FDA. However, its concentration in products is typically limited to ensure safety.

While generally considered safe for topical use, some individuals may experience sensitivity or allergic reactions to this dye. As with any synthetic colorant, patch testing is recommended for those with sensitive skin or a history of allergies. It's important to note that CI 42170 is not approved for use in products applied near the eyes in some regions due to potential irritation concerns. Formulators should be aware of regional regulations and consumer preferences when incorporating this ingredient into skincare products.