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Table 2 Mean values of oxide percentage and their standard deviation (in brackets) obtained by SEM-EDX in in samples 1 and 2 of funerary pigments found in the Rio Azul tomb

From: Funerary colors in Pre-classical Maya culture: the red pigment in the 19th tomb of Rio Azul (Peten, Guatemala)

Sample Ref.
(oxide wt %)
1 1Fa 2
Na2O 11 (2) 17.9 (0.9) < 0.01
MgO 0.67 (0.11) 4.74 (0.18) < 0.01
Al2O3 0.46 (0.12) 1.4 (0.9) 0.9 (0.9)
SiO2 1.6 (0.3) 71 (1) 8 (1)
K2O 0.2 (0.2) 0.30 (0.05) < 0.01
CaO 77 (2) 4.5 (0.5) 19.97 (0.16)
TiO2 < 0.01
FeO 2.1 (0.8) 0.20 (0.01) 15.62 (0.03)
SO3 1.9 (0.8) 13.96 (0.08)
Cl < 0.01
P2O5 0.3 (0.3) <0.01 2.3 (2)
HgO 3 (2) 34.0 (0.4)
PbO < 0.01 < 0.01
MnO 1.4 (0.6) < 0.01
As2O3 < 0.01 3.65 (0.18)
  1. a1F: glassy fragment in sample 1