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Table 2 Results of the FORS analysis in Santa María de Cuevas

From: An imaging and spectroscopic methodology for in situ analysis of ceiling and wall decorations in Colonial missions in Northern Mexico from XVII to XVIII centuries

Color Average spectral features (maxima position) Pigment identified
Reflectance (nm) Absorbance (nm)
White   1446, 1491, 1539, 1752, 1944, 2178, 2217, 2268 Gypsum
Dark yellow 550*, 601, 771 475, 893 Ocher
Orange 567*, 621, 742 523, 845 Iron oxide
Blue 516, 720* 648 Indigo
Brown 571*, 747 506, 847 Iron oxide-rich earth
Incarnate 565*, 619, 737 525, 844 Minium
Green (wall) 501–582 725 Malachite + a blue pigment, probably indigo
Green (ceiling) 547 734 Malachite
Red 1 577*, 613, 745 526, 847 Hematite
Red 2 586* 520, 560 Cochineal
  1. *Inflection point