Heritage Science

Table 3 Results of the EDX analysis for high lead glasses, samples I/18 (green), I/34 (golden) and I/59 (brown), amounts are given in wt%, nd—element was not detected, x—element was detected but not quantified

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

	Green flakes—I/18		Gold flakes—I/34		Brown flakes—I/59
Wt%	b1	b2	a1	a2	a1	a2	a3	a4
Na₂O	2.0	1.9	nd	nd	1.3	nd	nd	2.1
MgO	x	x	nd	nd	nd	nd	nd	x
Al₂O₃	1.4	1.1	x	x	1.3	nd	nd	x
SiO₂	37	38	34	35	34	26	26	34
K₂O	1.2	1.3	nd	nd	x	x	x	1.8
CaO	1.5	1.9	nd	x	1.7	1.1	1.0	1.5
MnO	x	nd	nd	nd	2.7	nd	nd	x
Fe₂O₃	x	x	2.6	3.2	nd	nd	nd	nd
CuO	4.0	4.6	x	x	nd	nd	nd	nd
Au₂O₃	nd	nd	x	x	x	x	x	x
PbO	57	56	66	65	52	73	73	60

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