Fig. 6From: The synthesis characterization of historical novel azo pigments: implications for conservation scienceRaman spectrum of the diarylide orange PO15. Peak positions (cm−1): PO15: 1652, 1604 (vs), 1573, 1516, 1448, 1387, 1305 (m), 1270 (s), 1174, 1115 (m), 1064, 999, 951, 912, 694, 669, 613, 487, 436, 411Back to article page