Back to Ingredient Dictionary

HC BLUE NO. 2

Description

HC Blue No. 2 is a semi-permanent hair dye ingredient widely used in the cosmetic industry for its ability to impart vibrant blue hues to hair. This synthetic colorant belongs to the family of HC (Hair Color) dyes, which are designed to penetrate the hair shaft and provide longer-lasting color compared to temporary dyes.

The chemical structure of HC Blue No. 2 allows it to bond with hair proteins, resulting in a more durable coloration that gradually fades over multiple washes. It is often used in combination with other dyes to create various shades of blue, purple, and green in hair coloring products.

HC Blue No. 2 is typically found in oxidative hair dye formulations, semi-permanent color treatments, and some temporary color products. Its effectiveness is enhanced when used with a developer or activator. While generally considered safe for use in hair dyes, it is important to note that some individuals may experience allergic reactions or skin sensitization. As with all hair dyes, a patch test is recommended before full application to check for potential adverse reactions.