Fig. 3From: The synthesis characterization of historical novel azo pigments: implications for conservation scienceStructure of historical diarylides synthesized: PY106: X = –Cl, R1 = –CH3 and –OCH3, R3 = –CH3 and –H; PY113: X = –Cl, Y = –Cl, R1 = –CH3, R3 = –Cl; PY124: X = –Cl, R1 = R3 = –OCH3; PO14: X = –OCH3, R1 = –CH3, R3 = –CH3; PO15: X = –CH3; PO16: X = –OCH3Back to article page