## 4 Results and Discussion
### Trace Element Composition
\begin{table}
\begin{tabular}{c c c c c c c c c c c c c c c c c c} \hline \hline \multirow{2}{*}{**Sample**} & \multicolumn{3}{c}{**Color**} & \multicolumn{1}{c}{**Classical Composition (wt.2\%)**} & \multirow{2}{*}{**Total**} & \multirow{2}{*}{**Remark**} \\ \cline{3-14}  & **Bead** & **Glass** & & & & & & & & & & & & & & & & & \\ \hline \multirow{3}{*}{mr-13} & \multirow{3}{*}{Gold} & \multirow{3}{*}{Amber} & \multirow{3}{*}{Outer} & 59.77 & 18.32 & 2.98 & 5.94 & 2.29 & 2.64 & 0.13 & 0.30 & 6.13 & nd & nd & 0.21 & 1.28 & 100 & - \\  & & & 0.43 & 0.18 & 0.02 & 0.05 & _0.06_ & _0.07_ & 0.06 & _0.04_ & 0.17 & - & - & _0.09_ & _0.04_ & - & - \\  & & & & 61.92 & 18.19 & 2.99 & 5.37 & 2.23 & 2.60 & 0.15 & 0.19 & 4.75 & nd & 0.12 & 0.28 & 1.20 & 100 & - \\  & & & & _0.68_ & 0.17 & _0.06_ & _0.08_ & _0.06_ & _0.09_ & _0.04_ & _0.02_ & 0.17 & - & _0.09_ & _0.04_ & _0.06_ & - & \\ \hline \multirow{3}{*}{mr-14} & \multirow{3}{*}{Gold} & \multirow{3}{*}{Amber} & \multirow{3}{*}{Outer} & 57.53 & 18.80 & 4.14 & 5.47 & 3.54 & 3.26 & 0.23 & 0.15 & 5.27 & nd & nd & 0.33 & 1.00 & 100 & - \\  & & & 0.27 & 0.25 & _0.03_ & _0.08_ & _0.08_ & _0.08_ & _0.04_ & _0.04_ & _0.12_ & _0.05_ & _- & _0.05_ & _0.05_ & _- & - \\  & & & & 95.94 & 17.60 & 3.95 & 4.86 & 4.15 & 3.05 & 0.30 & 0.15 & 5.55 & nd & nd & 0.34 & 0.91 & 100 & - \\  & & & 0.43 & 0.06 & _0.07_ & _0.07_ & _0.12_ & _0.08_ & _0.06_ & _0.04_ & _0.13_ & - & - & _0.13_ & _0.03_ & - & - \\ \hline \multirow{3}{*}{mr-15} & \multirow{3}{*}{Gold} & \multirow{3}{*}{Outer} & 59.95 & 18.68 & 2.96 & 5.94 & 2.26 & 2.68 & 0.12 & 0.30 & 5.54 & nd & nd & 0.26 & 1.30 & 100 & \multirow{3}{*}{Wathering} \\  & & & 0.28 & _0.09_ & _0.02_ & _0.09_ & _0.12_ & _0.07_ & _0.01_ & _0.04_ & _0.11_ & - & _- & _0.07_ & _0.06_ & - & \\  & & & 0.25 & 18.15 & 2.99 & 5.36 & 2.13 & 2.54 & 0.15 & 0.24 & 4.23 & nd & nd & 0.29 & 1.18 & 100 & \multirow{3}{*}{Wathering} \\  & & & 0.53 & 0.41 & _0.07_ & _0.20_ & _0.11_ & _0.11_ & _0.04_ & _0.05_ & _0.76_ & - & _- & _0.08_ & _0.06_ & - & \\ \hline \multirow{3}{*}{mr-16} & \multirow{3}{*}{Siver} & \multirow{3}{*}{Colorless} & \multirow{3}{*}{Outer} & 62.30 & 1.862 & 3.07 & _7.26_ & 5.18 & 2.70 & 0.20 & nd & 1.25 & nd & 0.46 & 0.77 & 100 & - \\  & & & 0.80 & 0.19 & 0.05 & _0.03_ & _0.06_ & _0.06_ & _0.09_ & - & - & _0.09_ & - & _0.08_ & _0.06_ & - & \\  & & & 62.07 & 16.89 & 3.10 & 7.37 & 5.05 & 2.73 & 0.21 & nd & 1.18 & 0.11 & nd & 0.50 & 0.79 & 100 & - \\  & & & 0.24 & 0.24 & _0.03_ & 0.15 & _0.08_ & _0.11_ & _0.04_ & - & _0.07_ & _0.10_ & - & _0.07_ & _0.04_ & - & \\ \hline \multirow{3}{*}{mr-17} & \multirow{3}{*}{Siver} & \multirow{3}{*}{Colorless} & \multirow{3}{*}{Outer} & 62.38 & 18.671 & 3.09 & 7.35 & 5.08 & 2.74 & 0.21 & nd & 1.23 & nd & nd & 0.43 & 0.78 & 100 & - \\  & & & 0.48 & _0.11_ & _0.07_ & _0.12_ & _0.11_ & _0.03_ & - & _0.04_ & - & _- & _0.05_ & _0.06_ & - & \\  & & & 0 The silver foil beads found in the Tomb [PERSON] in Gongju exhibited contrasting characteristics to the gold foil beads found on the Korean Peninsula. Most gold foil beads have been identified as Roman glass, which is Natron glass, while silver foil beads are plant ash glass, which is a type of Sasanian glass that was popular in Europe and Mesopotamia [16]. Moreover, gold-colored silver foil beads excavated from the Bukel ruins in Albania, an Eastern European country, with the same period of construction as the Tomb of [PERSON] in Gongju, were also identified as plant ash glass [17]. These results suggest that silver foil beads are foreign relics that were imported through trade rather than manufactured on the Korean Peninsula. Thus, once enough data is accumulated to determine whether these are related to the origin of the ancient silver foil beads, further studies are necessary to determine the correlation in terms of materials. The outer glass of the silver foil beads was analyzed by LA-ICP-MS to obtain quantitative values for 20 trace elements (Table 4).