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Para Phenylene Diamine
p-Phenylenediamine (PPD) is an organic chemical formulated as CH₄(NH₂)₂ . The aniline derivative is solid and white in colour that can reacts with air and turn to dark. PPD is widely used as permanent hair dyes solution (oxidative dyes) and dye intermediate, vulcanization accelerator, in textile, photo copy and printing inks, lithography plates and photographic developments.