Back to Ingredient Dictionary

HC BROWN NO. 2

Description

HC BROWN NO. 2, also known as 2-Nitro-p-phenylenediamine, is a synthetic hair dye molecule widely used in the cosmetic industry for its ability to impart rich brown hues to hair. This semi-permanent colorant is particularly effective in covering gray hair and providing long-lasting color results. HC BROWN NO. 2 penetrates the hair shaft, forming larger color molecules that remain trapped within the cortex, ensuring color stability and resistance to washing.

The compound is typically used in concentrations ranging from 0.1% to 3.0% in hair dye formulations, depending on the desired intensity and shade. It is often combined with other dye molecules to create a spectrum of brown tones. HC BROWN NO. 2 exhibits good compatibility with common hair dye ingredients and works effectively in both oxidative and non-oxidative coloring systems.

While generally considered safe for use in hair dyes, some individuals may experience skin sensitization. As with all hair dyes, a patch test is recommended before use to check for potential allergic reactions. HC BROWN NO. 2 is regulated by cosmetic authorities worldwide, including the European Commission and FDA, with specific guidelines for its use in hair coloring products.