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Table 1 pXRF chemical characterization of the Sphinx Room

From: Integrated analytical approach to unveil the secrets of the recently discovered “Sphinx Room”: a new piece of Domus Aurea puzzle

LLD (ppm) 75 75 75 75 10   60   1   3 1 75 3 3
Color Wall Point K Ca Ti V Cr Fe Cu Rb Sr Zr As Sn Ba W Pb
Blue S 1 1701 26,030 113 bld 160 626 1,353,709 33 1857 15 12 1 bld 19 126
Blue S 2 1173 26,360 98 bld 152 425 1,290,183 31 1825 10 16 98 122 9 89
Greyish N 3 489 78,250 bld bld bld 54 bld 18 324 19 bld 159 bld 7 38
Greyish N 4 1409 54,300 bld bld bld 274 bld 12 572 13 bld 76 739 4 49
Greyish N 5 1052 68,940 bld bld bld 233 bld 26 584 23 3 126 473 8 51
Greyish N 6 437 81,910 bld bld bld 111 bld 17 400 12 bld 193 271 11 55
Greyish N 7 531 51,650 347 bld bld 265 bld 19 501 14 bld 40 4539 bld 58
Greyish vault 8 2666 46,040 81 bld 17 703 71 43 933 16 5 28 bld bld 37
Greyish vault 9 1731 54,650 bld bld 11 414 2424 28 861 18 6 80 bld 9 44
Greyish vault 10 1416 39,570 bld bld 15 450 557,549 16 968 6 24 45 bld 10 434
Yellow N 11 601 81,580 bld bld bld 100 bld 22 408 20 bld 158 196 bld 50
Yellow N 12 525 51,790 187 bld bld 458 96 18 703 13 182 39 2702 bld 2255
Yellow N 13 423 43,650 242 bld bld 908 352 17 607 23 117 5 2992 bld 1733
Yellow E 14 362 18,830 bld bld bld 162 bld 10 739 8 bld 15 bld 15 33
Yellow vault 15 475 24,800 bld bld bld 724 134 12 569 8 bld 48 bld bld 55
Yellow vault 16 765 35,890 bld bld bld 711 1117 20 698 12 bld 27 bld 3 56
Orange N 17 284 58,720 89 bld bld 176 bld 6 292 9 517 115 938 bld 5857
Red N 18 358 76,820 bld bld bld 237 bld 13 325 16 62 31 bld 18 54
Red N 19 468 77,710 bld bld bld 210 bld 14 344 15 78 121 bld 16 61
Red E 20 577 51,410 80 bld 10 1609 99 18 541 16 797 38 bld 11 3135
Red vault 21 936 50,360 bld bld bld 1861 98 21 1043 15 971 35 bld 69 37
Red vault 22 463 45,290 bld bld 11 857 2514 6 715 9 396 11 bld 4 3668
Red vault 23 977 55,940 bld bld bld 839 367 19 1102 12 85 48 bld 13 275
Red vault 24 489 45,280 bld 90 bld 925 578 12 1027 6 1700 11 bld 26 4853
  1. Data are expressed as ppm. LLD provided by the pXRF manufacturer are reported; bld = below limit of detection. The sample names correspond to Fig. 4. Elements in bold are related to common Roman age pigments