chemicals : P-phenylenediamine;p-phenylenediamine Sulfate;1, 2, 4-benzenetriol;5-amino-o-cresol;dye Blue 2;hc Red 3;4-amino-3-nitrophenol;p-phthaloyl Chloride;phthaloyl Dichloride;3-nitrobenzaldehyde;3, 4-dimethoxybenzaldehyde;2, 4, 5-trimethoxybenzaldehyde;2, 4, 5-trimethoxybenzoic Acid;5-sulphosalicylic Acid;2-amino-6-chiloro-3-nitropyridine