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HC BROWN NO. 3

Description

HC Brown No. 3, also known as N,N-bis(2-hydroxyethyl)-2-nitro-p-phenylenediamine, is a synthetic hair dye ingredient commonly used in semi-permanent and temporary hair coloring products. This compound belongs to the family of nitrophenylene diamines and is characterized by its ability to impart brown shades to hair.

The molecule consists of a para-phenylenediamine core with nitro and bis(2-hydroxyethyl)amino substituents. Its chemical structure allows for effective penetration into the hair shaft, where it interacts with the keratin proteins to provide color. HC Brown No. 3 is typically used in combination with other dye molecules to achieve desired hues and color intensity.

This ingredient is approved for use in hair dye formulations by regulatory bodies such as the European Commission and the FDA, with specific concentration limits. It is generally considered safe when used as directed, but like many hair dye components, it may cause allergic reactions in some individuals. Patch testing is recommended before use to assess potential sensitivities.

HC Brown No. 3 offers good color stability and wash-fastness compared to some natural dyes. However, its performance can be influenced by factors such as hair porosity, pH of the formulation, and the presence of other active ingredients in the hair color product.