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Table 1 Chemical compositions of Nanhai I shipwreck beads (w%)

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

  PbO SiO2 SnO2 K2O Na2O Al2O3 MgO CaO CuO (blue beads)/Cu2O (red beads) Fe2O3
Small opaque Yellow beads (n = 5) 59.14 32.40 4.38 3.66 0.23 0.19
SD 1.94 1.67 0.47 0.56 0.21 0.13
Large opaque Yellow beads (n = 5) 57.38 34.72 3.12 4.27 0.34 0.16
SD 2.03 1.92 0.30 0.20 0.15 0.09
Opaque orange-red beads (n = 8) 46.37 32.62 1.39 8.40 0.26 0.47 0.08 0.48 9.40 0.54
SD 1.06 1.21 0.46 0.75 0.29 0.32 0.11 0.36 1.50 0.22
Transparent blue beads
(n = 2)
45.51 40.47 8.34 0.77 0.44 0.24 3.34 0.75 0.16
SD 0.06 0.41 0.05 0.11 0.05 0.04 0.24 0.01 0.16
Transparent light red beads (n = 6) 51.23 39.34 7.17 1.16 0.25 0.08 0.03 0.55 0.20
SD 2.30 1.67 1.05 0.53 0.13 0.08 0.04 0.17 0.08
Translucent Dark red beads (n = 4) 63.44 32.36 0.47 0.22 0.45 1.64 1.42
SD 1.14 1.13 0.03 0.10 0.06 0.10 0.10