## 2 Materials and Methods  
### Materials  
Following excavation, the original forms of the glass beads from stone-lined tomb No. 8 at the time that they were buried were preserved; they were generally blue in color. The glass beads from pit tomb No. 11 were of various colors, such as blue, brown, green, and blue-green, and beads of the same color were grouped together. The glass beads from pit tomb No. 12 were distributed along one side of the site and were all brown in color. Glass beads of various colors, such as blue, light blue, brown and green, were excavated from pit tomb No. 18.  
To identify the compositions and material features of the glass beads, they were classified, and the major colors were identified (Table 1). The colors selected were blue, brown, green, light blue, and blue-green. The glass beads from stone-lined tomb No. 8 were excavated in fragments instead of round forms, and the sample used for the analysis was a single fragment with minimal weathering (Table 1).  
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \begin{tabular}{c} **Sample** \\ **No.** \\ \end{tabular} & **Material** & **Location** & \begin{tabular}{c} **Tomb** \\ **Type** \\ \end{tabular} & **Color** & **Number** & \begin{tabular}{c} **Internal** \\ **Diameter** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **External** \\ **Diameter** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **Thickness** \\ **(mm)** \\ \end{tabular} & **Characteristics** \\ \hline S8-G-Blue & glass bead & No. 8 & \begin{tabular}{c} stone-lined \\ tomb \\ \end{tabular} & Blue & \begin{tabular}{c} broken \\ pieces \\ \end{tabular} & 0.15–0.25 & 0.43–0.64 & 0.25–0.51 & \begin{tabular}{c} translucent, small \\ amount of air bell, \\ black and \\ yellow impurities, \\ crack of surface, \\ surface weathering \\ \end{tabular} \\ \hline S11-G- & & & & Brown & 4 & 0.10–0.15 & 0.34–0.35 & 0.18–0.22 & \begin{tabular}{c} opaque, elongated \\ black impurities, \\ small amount of air bell, \\ white particles \\ on surface \\ \end{tabular} \\ \hline S11-G- & glass bead & No. 11 & pit tomb & Green & 16 & 0.05 & 0.19–0.24 & 0.09–0.16 & \begin{tabular}{c} opaque, many air \\ bell, black, yellow, \\ and \\ yellowish-brown \\ impurities \\ \end{tabular} \\ \hline S11-G- & & & & Blue- & broken & – & – & 0.08–0.42 & \
\begin{tabular}{c} translucent, many \\ air bell, surface \\ weathering \\ \end{tabular} \\ \hline S12-G- & glass bead & No. 12 & pit tomb & Brown & 121 & 0.10–0.15 & 0.20–0.36 & 0.09–0.32 &
\begin{tabular}{c} opaque, black \\ impurities, small \\ number of air bells \\ \end{tabular} \\ \hline \hline \end{tabular}
\end{table}
Table 1: Descriptions of glass beads from the Suchonri tomb complex.  
Brown, green, and blue-green glass was selected from pit tomb No. 11 (Table 1). Blue-green glass beads were excavated in fragments, and one fragment with minimal weathering was selected, similar to the glass from stone-lined tomb No. 8. As only brown glass was collected from pit tomb No. 12, only one bead was analyzed (Table 1). Light-blue, brown, and green glass beads were collected from pit tomb No. 18, and one glass bead of each color was selected for analysis (Table 1).  
The brown glass beads from pit tomb Nos. 11 and 12, and green glass beads from tomb No. 18 were the largest in size. The widths of the round glass beads, aside from the fragments, were 0.09 to 0.32 mm for brown glass beads from pit tomb No. 12, and 0.22 to 0.34 mm and 0.19 to 0.32 mm, respectively, for the light-blue and green glass beads from pit tomb No. 18. These glass beads were the thickest (Table 1).  
This study analyzed the physical and chemical compositions of glass beads and investigated the color diversity based on the findings. Eight samples were used for the analysis, including one sample from stone-lined tomb No. 8, three samples from stone-lined tomb No. 11, one sample from pit tomb No. 12, and three samples from pit tomb No. 18 at the Suchonri site.