Novel characterization techniques for cultural heritage using a TEM orientation imaging in combination with 3D precession diffraction tomography: a case study of green and white ancient Roman glass tesserae

Heritage Science

Table 1 EPMA microanalysis data performed on several areas of the green tesserae sample

Green	Diameter	SiO₂	Al₂O₃	K₂O	CaO	SnO₂	Na₂O	MgO	TiO₂	MnO	FeO	CoO	CuO	SO₃	PbO	Cl	Sb₂O₅	Total
1	> 1 μm	42.93	1.16	0.29	4.24	23.54	3.91	0.31	0.04	0.26	0.68	0.00	2.00	0.29	8.63	1.12	0.00	89.40
2	> 1 μm	41.03	1.24	0.27	4.70	13.11	8.86	0.28	0.00	0.24	0.60	0.00	2.08	0.20	22.86	1.04	5.77	102.28
3	> 1 μm	38.97	1.12	0.34	4.72	9.32	4.80	0.28	0.05	0.25	0.62	0.07	1.85	0.23	18.58	1.05	6.32	88.56
4	< 1 μm	57.09	1.81	0.48	5.61	0.32	5.86	0.54	0.08	0.39	0.70	0.10	2.67	0.26	10.06	1.66	1.38	89.01
5	< 1 μm	57.91	1.83	0.52	5.61	0.27	5.39	0.52	0.06	0.37	0.66	0.00	2.66	0.29	9.18	1.64	1.19	88.09
6	Glass	59.59	1.90	0.60	5.94	0.26	6.66	0.58	0.07	0.37	0.69	0.00	2.73	0.26	9.41	1.67	0.87	91.60
7	Glass	59.58	1.86	0.63	5.88	0.25	6.59	0.60	0.07	0.38	0.68	0.00	2.87	0.24	9.42	1.66	0.89	91.61
8	Glass	59.38	1.91	0.58	5.91	0.22	6.63	0.58	0.04	0.40	0.66	0.00	2.83	0.26	9.29	1.65	0.81	91.14
9	Glass	59.32	1.92	0.58	5.97	0.24	6.39	0.56	0.10	0.37	0.68	0.02	2.75	0.22	9.65	1.66	0.89	91.32
10	Glass	59.56	1.91	0.57	5.94	0.23	6.65	0.63	0.06	0.39	0.67	0.09	2.78	0.24	9.59	1.65	0.85	91.80
Average pigment comp.		47.59	1.43	0.38	4.98	9.31	5.76	0.39	0.05	0.30	0.65	0.03	2.25	0.25	13.86	1.30	2.93	91.47
Average glaze comp.		59.49	1.90	0.59	5.93	0.24	6.58	0.59	0.07	0.38	0.68	0.02	2.79	0.25	9.47	1.66	0.86	91.49

Elemental composition obtained by means of EPMA in wt% on green tesserae. Typical analyzed areas are shown in Additional file 1: Fig. S4