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Table 2 Results of the EDX analysis for alkali lead glasses, samples I/3 (blue), I/39 (colourless), I/60 (turquoise) and I/62 (blackish purple), amounts are given in wt%, nd —element was not detected, x—element was detected but not quantified. Usually the composition was very homogenious and glassy, spots with a unusual compostion are marked in second header line

From: Investigation of coloured lead glass glitter from an early eighteenth century material collection, Cambridge, by electron microscopy/energy dispersive X-ray analysis

Wt% Blue flakes—I/3 White flakes—I/39 Ash coloured flakes—I/60 Blackish purple flakes—I/62
   Dark zone          Metal Metal    Silica
b1 b2 b3 c1 c2 b1 b2 b3 b1 b2 b1 b2 b3 b4 b5 b6
Na2O 8.8 7.9 6.3 4.8 4.5 6.8 3.8 3.6 9.5 9.8 4.8 nd nd 4.5 3.9 1.1
MgO 3.0 2.4 2.6 2.0 2.2 1.4 1.2 1.3 3.2 3.0 1.8 1.5 1.8 1.4 x 1.6
Al2O3 x x x x x nd x nd x x x nd nd x 1.0 nd
SiO2 56 56 59 56 56 56 52 46 58 58 39 1.7 1.7 36 35 80
Cl x x x x x x x x x x nd nd nd nd nd nd
K2O 4.0 4.0 4.5 9.4 9.4 4.3 5.3 7.1 4.1 4.4 3.8 nd nd 3.4 3.5 x
CaO 5.2 5.2 6.1 4.0 3.9 3.9 2.9 2.2 5.5 5.4 3.3 nd n.d 3.0 3.1 3.8
MnO x x x nd nd x x x x x 3.1 25 25 2.8 3.0 x
Fe2O3 x x x x x x nd nd nd nd 4.2 46 46 3.8 4.4 2.1
NiO nd nd nd nd nd nd nd nd nd nd nd 17.8 15.8 nd nd nd
CoO x x x x x nd nd nd nd nd nd nd x nd nd nd
CuO x x x nd nd nd nd nd x nd 3.9 4.1 5.0 3.2 3.7 nd
ZnO nd nd nd nd nd nd nd nd nd nd nd 2.9 2.9 nd nd nd
As2O3 x x x x x nd x nd x x x nd nd x 1.0 nd
Sb2O3 nd nd nd nd nd nd nd nd nd nd nd x nd nd nd nd
PbO 22 23 20 23 23 25 33 39 18 18 45 nd nd 41 41 8.6