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Table 1 Average chemical compositions, and corresponding standard deviations of the glass of fragments of the three panels ‘Saint Ambrose’, ‘Saint Gregory’ and ‘Virgin of the Apocalypse’ obtained by \(\mu\)-EDXRF (minimal data points = 3), expressed wt% of the corresponding most common oxides present in glass

From: A transparent dialogue between iconography and chemical characterisation: a set of foreign stained glasses in Portugal

Oxides: SiO\(_2\) Al\(_2\)O\(_3\) P\(_2\)O\(_5\) CaO K\(_2\)O MnO Fe\(_2\)O\(_3\) CoO CuO Cl
Panel of Saint Ambrose
 Colourless 57.2 ± 0.8 2.8 ± 0.2 1.6 ± 0.1 23.0 ± 1.7 4.7 ± 0.5 1.29 ± 0.09 0.49 ± 0.03 n.d. 0.01 ± 0.00 0.26 ± 0.08
 Red 58.0 ± 1.7 3.3 ± 0.6 2.00 ± 0.00 23.0 ± 0.0 5.3 ± 0.2 0.98 ± 0.04 0.57 ± 0.02 n.d. 0.4 ± 0.1 0.37 ±0.04
 Brown T1 58.0 ± 1.1 2.5 ± 0.2 1.1 ± 0.1 18.2 ± 0.9 10.1 ± 0.2 0.52 ± 0.02 0.64 ± 0.03 n.d. 0.02 ±0 .00 0.11 ± 0.03
 Brown T2 60.0 ± 0.5 2.4 ± 0.3 1.1 ± 0.1 13.8 ± 0.7 11.9 ± 0.8 1.05 ± 0.04 0.26 ± 0.01 n.d. 0.04 ± 0.03 0.2 ± 0.1
 light Purple 59.2 ± 0.5 2.8 ± 0.3 1.03 ± 0.05 17.3 ± 0.1 12.8 ± 0.4 1.25 ± 0.01 0.28 ± 0.00 n.d. 0.02 ± 0.01 0.11 ± 0.02
 Blue 58.3 ± 1.7 2.9 ± 0.1 1.4 ± 0.1 20.5 ± 1.5 5.8 ± 0.8 0.99 ± 0.05 0.8 ± 0.2 0.24 ± 0.07 0.05 ± 0.01 0.24 ± 0.04
Panel of Saint Gregory
 Colourless 55.7 ± 0.6 2.7 ± 0.3 2.60 ± 0.04 21.6 ± 0.1 4.73 ± 0.03 1.25 ± 0.01 0.49 ± 0.01 n.d. 0.02 ± 0.00 0.29 ± 0.02
 Red 57.0 ± 0.4 1.8 ± 0.4 3.1 ± 0.6 22.2 ± 0.1 6.13 ± 0.06 0.91 ± 0.01 0.51 ± 0.01 0.01 ± 0.00 0.17 ± 0.01 0.20 ± 0.02
 Blue 60.1 ± 0.4 1.6 ± 0.3 2.9 ± 0.3 19.7 ± 0.2 5.20 ± 0.00 1.01 ± 0.01 1.07 ± 0.01 0.32 ± 0.01 0.07 ± 0.00 0.18 ± 0.01
 Bordeaux 52.0 ± 1.0 1.7 ± 0.5 3.7 ± 0.6 19.4 ± 0.4 13.1 ± 0.1 1.84 ± 0.03 0.19 ± 0.01 0.01 ± 0.01 0.03 ± 0.01 0.05 ± 0.02
Panel of the Virgin of the Apocalypse
 Colourless 56.5 ± 0.7 2.13 ± 0.07 0.27 ± 0.06 22.7 ± 0.6 4.8 ± 0.1 1.30 ± 0.00 0.51 ± 0.02 n.d. 0.01 ± 0.00 0.25 ± 0.01
 Yellow 57.2 ± 1.2 1.4 ± 0.4 1.1 ± 0.3 15.9 ± 0.5 12.8 ± 0.4 0.40 ± 0.02 0.36 ± 0.01 n.d. 0.01 ± 0.00 0.08 ± 0.02
 Brown T1 56.2 ± 2.7 1.4 ± 0.2 0.27 ± 0.06 16.7 ± 0.6 13.2 ± 0.4 0.42 ± 0.02 0.37 ± 0.02 n.d. 0.01 ± 0.00 0.08 ± 0.01
Oxides: BaO PbO SnO\(_2\) SrO TiO\(_2\) ZnO NiO Rb\(_2\)O Na\(_2\)O +MgO
Panel of Saint Ambrose
 Colourless 0.72 ± 0.07 0.04 ± 0.02 0.11 ± 0.01 0.09 ± 0.01 0.10 ± 0.01 0.04 ± 0.01 Trace Trace 7.6 ± 1.6
 Red 0.51 ± 0.03 0.03 ± 0.00 0.13 ± 0.02 0.09 ± 0.00 0.12 ± 0.00 0.03 ± 0.00 n.d. Trace 7.1 ± 0.4
 Brown T1 0.64 ± 0.03 0.07 ± 0.01 0.09 ± 0.02 0.16 ± 0.01 0.15 ± 0.01 0.03 ± 0.00 Trace 0.01 ± 0.00 7.7 ± 0.2
 Brown T2 0.50 ± 0.04 0.13 ± 0.13 0.05 ± 0.01 0.06 ± 0.00 0.07 ± 0.01 0.03 ± 0.00 Trace 0.02 ± 0.00 8.6 ± 0.8
 Light Purple 0.68 ± 0.03 0.05 ± 0.03 0.10 ± 0.01 0.10 ± 0.00 0.11 ± 0.01 0.03 ± 0.00 Trace 0.02 ± 0.00 7.24 ± 0.08
 Blue 0.63 ± 0.03 0.04 ± 0.01 0.09 ± 0.01 0.09 ± 0.02 0.09 ± 0.02 0.03 ± 0.01 0.05 ± 0.01 Trace 7.7 ± 0.7
Panel of Saint Gregory
 Colourless 0.67 ± 0.06 0.06 ± 0.02 0.14 ± 0.02 0.10 ± 0.01 0.11 ± 0.01 0.04 ± 0.00 n.d. 0.01 ± 0.00 9.5 ± 0.8
 Red 0.47 ± 0.03 0.04 ± 0.00 0.14 ± 0.01 0.10 ± 0.00 0.13 ± 0.01 0.02 ± 0.00 0.01 ± 0.00 Trace 6.6 ± 0.7
 Blue 0.50 ± 0.00 0.06 ± 0.02 0.12 ± 0.00 0.08 ± 0.00 0.14 ± 0.01 0.02 ± 0.00 0.07 ± 0.00 Trace 6.6 ± 0.1
 Bordeaux 0.83 ± 0.06 0.07 ± 0.01 0.12 ± 0.01 0.10 ± 0.00 0.05 ± 0.01 0.03 ± 0.00 n.d. 0.02 ± 0.00 7.3 ± 0.8
Panel of the Virgin of the Apocalypse
 Colourless 0.53 ± 0.06 0.06 ± 0.03 0.16 ± 0.04 0.10 ± 0.00 0.13 ± 0.01 0.04 ± 0.00 n.d. Trace 8.6 ± 1.9
 Yellow 0.51 ± 0.03 0.09 ± 0.08 0.16 ± 0.05 0.20 ± 0.01 0.13 ± 0.00 0.03 ± 0.00 0.01 ± 0.00 0.03 ± 0.00 9.8 ± 1.6
 Brown T1 0.57 ± 0.06 0.02 ± 0.00 0.18 ± 0.02 0.21 ± 0.01 0.13 ± 0.00 0.03 ± 0.00 0.01 ± 0.00 0.04 ± 0.02 6.7 ± 2.6
  1. Glass classified as HLLA is highlighted in italic, whilst glass classified as K–Ca glass is shown in bolditalic. ‘n.d.’—not determined; trace—wt% \(<0.01\)
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