PPD hair dye, or para-phenylenediamine, is a synthetic organic compound primarily intended for use as an intermediate in the manufacture of azo dyes and other organic chemicals.
It is also widely used as a permanent hair dye, imparting a dark, rich color to hair and providing long-lasting coverage of gray hair. PPD hair dye has gained significant popularity due to its effectiveness and affordability. It is a common ingredient in both professional and home hair coloring products.