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Fig. 6 | Heritage Science

Fig. 6

From: Characterization of glass beads from Nanhai I shipwreck and new evidence of lead tin yellow type II in China

Fig. 6

Images of a glass directly synthesized from Pb3O4, K2CO3, SiO2 and SnO2 at 900 °C (left), glass synthesized with pre-synthesized lead tin yellow type II calcined at 800 °C (up), 850 °C (right) and 900 °C (bottom), all for 0.5 h; b BSE images of glass fired at 900℃ with SnO2 as Sn source, showing K2SnxPb(1-x)Si3O9 crystals (dark particles), and c glass fired at 850 °C with synthesized lead tin yellow type II as Sn source, showing remaining lead tin yellow type II (lighter particles) and newly formed K2SnxPb(1-x)Si3O9 crystals (darker particles near the bubble)

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