पीपीडी

Also known as p-phenylene diamine, 4-aminoaniline, 1,4-diaminobenzene, 1,4-phenylene diamine, 1,4-benzenediamine, p-diaminobenzene, benzene-1,4-diamine, p-Diaminobenzene

'''p-Phenylenediamine (PPD''') is an organic compound with the formula C6H4(NH2)2. This derivative of aniline is a white solid, but samples can darken due to air oxidation. It is mainly used as a component of engineering polymers and composites like kevlar. It is also an ingredient in hair dyes and is occasionally used as a substitute for henna.