Noun
diphenylamine (countable and uncountable, plural diphenylamines)
English Wikipedia has an article on:diphenylamineWikipedia
(chemistry) an aromatic amine, (C6H5)2NH, used in the manufacture of plastics, dyes, explosives, pesticides, fungicides and pharmaceuticals
Synthesis The compound was originally prepared by Bernthsen in 1883 via the reaction of diphenylamine with sulfur, but more recent syntheses rely on the cyclization of 2-substituted diphenyl sulfides. Source: Internet
The color change of the solution from orange to green is not definite, therefore an indicator such as sodium diphenylamine is used. Source: Internet