Sample | Description | XRF analysis | FTIR spectroscopy | Raman spectroscopy | Optical microscopy | |||
---|---|---|---|---|---|---|---|---|
Elements found | Pigment suggestion | Infrared bands (cm− 1) | Mineral | Raman bands (cm− 1) | Mineral | Thickness, µm | ||
Plaster | Ca, Si, Al, Mg, Fe, P, K, Cl, S, Mn, Ti | Lime, sand | 1793, 1397, 871, 712; 3390b, 1077c, 1016b, 613b; 1156c | Calcite; Clay minerals; Quartz | – | |||
M1 | Yellow | Ca, Si, Al, Fe, Pb, S, K, Ti, P, Cr, Mna | Yellow ochre, lime, white lead or massicot | 1795, 1410, 873, 712; 3695, 3619, 1105c, 1027, 1007, 913, 534; 695, 433; 3300b, 796, 749, 466 | Calcite; Kaolinite; Quartz; Goethite d | 148, 281, 1087; 294, 388, 561; 146, 281 | Calcite; Goethite; Massicot | 25 |
M2 | Red | Si, Ca, Fe, Al, Mg, K, P, S, Ti, Pb, Mn, Sr, Cl, Ba, As | Red ochre, lime | 1795, 1413, 873, 712; 1032b; 1162, 796, 777, 694, 519; 445 | Calcite; Clay minerals; Quartz; Hematite | 154, 293, 1086; 226, 293, 408, 513, 610, 652, 1309 | Calcite; Hematite | 50 |
M3 | Green | Si, Ca, Fe, Al, K, Mg, Pb, P, S, Ti, Mn, Sr, As | Green earth, lime | 1795, 1412, 872, 712; 3350b, 1102c, 1010c; 3554, 3526, 967, 797, 679, 487, 449, 438 | Calcite; Clay minerals; Celadonite | 30–40 | ||
M4 | Blue | Si, Ca, Al, Mg, K, S, Fe, P, Ti, Cl, Sr, Ba | Lazurite, lime | 1795, 1413, 873, 712; 3696b, 3620, 1088c; 797, 779, 695, 519c; 1001, 654, 577, 534, 441 | Calcite; Clay minerals; Quartz; Lazurite | 1091; 547, 1091 | Calcite; Lazurite | 2 layers total 40 μm |
M5 | Black | Ca, Si, Al, Mg, Fe, K, P, Ti, Mn, S, Pb, Sr | “Reft’ ” (carbon black), lime | 1795, 1409, 872, 711; 3695, 3620, 1095c, 1029, 1007, 911, 536; 789, 751, 466 | Calcite; Kaolinite; Goethite | 163, 1086; 1335, 1620 | Calcite; “Reft’ ” (carbon black) | 20–50 |
M6 | Orange | Ca, Pb, S, Si, Al, As, Fe, P, K, Cl, Ti, Mn | Red lead, lime, clay minerals | 1795, 1403, 872, 712; 3410b, 1079c, 1030, 781, 527; 1160 | Calcite; Clay minerals; Sand | 86, 122, 152, 222, 312, 391, 549 | Red lead | 40–60 |