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HYDROXYPROPYL-P-PHENYLENEDIAMINE

Description

Hydroxypropyl-p-phenylenediamine is a synthetic hair dye ingredient primarily used in permanent hair coloring products. This compound belongs to the family of aromatic diamines and functions as a precursor in oxidative hair dye formulations. When combined with an oxidizing agent, typically hydrogen peroxide, it develops into the final color molecules within the hair shaft.

This ingredient is known for its ability to penetrate the hair cuticle and react with other dye precursors to create a wide range of color outcomes, particularly in the brown to black spectrum. Its molecular structure allows for effective binding to the keratin in hair, resulting in long-lasting color. Hydroxypropyl-p-phenylenediamine is often preferred in formulations due to its relatively lower allergenic potential compared to some other para-phenylenediamine (PPD) derivatives.

In hair dye formulations, it is typically used in concentrations ranging from 0.1% to 3%, depending on the desired color intensity and shade. While generally considered safe when used as directed, patch testing is recommended before application to identify potential allergic reactions. As with all oxidative hair dyes, proper usage and adherence to manufacturer instructions are crucial for optimal results and minimizing adverse effects.