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HC BLUE NO. 9

Description

HC Blue No. 9 is a semi-permanent hair dye ingredient known for its vibrant blue coloration. This synthetic colorant belongs to the family of HC (Hair Color) dyes and is primarily used in temporary and semi-permanent hair coloring products. HC Blue No. 9 is particularly effective in creating cool-toned blue shades and can be combined with other dyes to achieve various hues.

The molecule is designed to penetrate the hair shaft without causing significant damage to the hair structure. It adheres to the cuticle and cortex, providing color that typically lasts through several washes. HC Blue No. 9 is non-oxidative, meaning it doesn't require a developer to work, making it gentler on the hair compared to permanent dyes.

This colorant is approved for use in hair dye formulations in many countries, including the European Union, where it's regulated under Annex III of the EU Cosmetics Regulation. While generally considered safe for intended use, some individuals may experience skin sensitization. As with all hair dyes, a patch test is recommended before full application to check for potential allergic reactions.