Heritage Science

Table 1 Chemical compositions of the ancient glass and its replicas (wt%)

From: Opaque ancient K₂O–PbO–SiO₂ glass of the Southern Song Dynasty with fluorite dendrites and its fabrication

Sample	Temp. (°C)	Cooling	PbO	SiO₂	K₂O	CaO	CuO	Al₂O₃	Na₂O	Fe₂O₃	MgO	P₂O₅	F
Ancient glass	Unknown	Unknown	37.07	44.66	10.24	4.84	0.53	0.44	0.26	0.18	0.18	ND	1.61
Replica 1	950	In furnace	36.41	44.69	11.53	5.59	0.62	ND	ND	ND	ND	ND	1.16
Replica 2	1000	In furnace	35.70	44.29	11.26	6.46	0.67	ND	ND	0.13	ND	ND	1.48
Replica 3	1050	In furnace	35.14	44.92	11.06	6.32	0.85	0.10	0.33	ND	ND	ND	1.28
Replica 4	1000	In air	36.64	44.24	11.37	5.79	0.47	ND	0.17	ND	ND	ND	1.31

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