Lead isotope ratio of bronze artifacts excavated from Dongchon Site in Sunchang have determined by TIMS.As results of comparison lead isotope ratio of bronze objects with the provenance data of galenas of Korea, China, and Japan, the provenance of three material of bronze objects were turned out to originate from the southern and northern part of China. On the other hands, data were plotted either in zone 3 of the South Korean galena map. The results of these scientific analysis of bronze objects can be used as basic data in comparison researches on manufacturing technology, provenance of bronze objects to be found in the future.

This study aims to investigate the corrosion characteristics of bronze artifacts according to lead contents by conducting a comprehensive analysis on corrosion layers and corrosion products focusing on excavated bronze artifacts of ternary alloys with various chemical compositions.</br>From the research outcome, the selective corrosion, high-tin corrosion layers, and lead compounds were identified in two excavated bronze artifacts, and there was a difference in the structure of corrosion layers and the corrosion products of core metal between high lead content bronze and the lowest lead content bronze. Especially, based on the specimen with the highest lead content, it was identified that lead oxide in reddish color and a large quantity of lead corrosion products including lead carbonate in various colors such as white, red, yellow, and green are distributed inside the base metal.</br>In this study, the number of analyzed samples is insufficient to represent the corrosion characteristics of bronze artifacts made of the ternary alloys. Therefore, it is judged that basic data should be accumulated by conducting a corrosion characteristic study on bronze artifacts with various alloy composition ratios in the future.

In this study, the research objects are gilt plated silver-iron nails excavated from the west of the tombs in Neungsan-ri, Buyeo. A gilt plated silver-iron nail was fabricated by combining silver and iron via heating and then gilding amalgam on top of this combination, demonstrating that this ancient artifact that can be replicated using current technology. Since the metal (Au, Ag) surface of these gilt plated artifacts are covered with iron oxide, which slips into the cracks and scratches of the artifacts as well, desalination is essential. Based on the results of the preliminary experiment, the research objects were classified into grades A, B, and C, according to the degree of corrosion and then desalinated using an alkali solution (NaOH, Sodium Sesquicarbonate of 0.1 M) at 60°C. The results demonstrate that the more serious is the degree of corrosion, the more is the amount of Cldetected. Further, more Clwas released when NaOH was used than when sodium sesquicarbonate was used, for all grades except Grade A. Furthermore, the more serious is the degree of corrosion, the longer is the desalination period and the reaction with NaOH for all grades except Grade A. A comparison of the Fe composition of the surface before and after desalination shows that Fe composition is the use of NaOH resulted in a smaller increase compared with the use of sodium sesquicarbonate, for all grades except Grade B. However, four of the nails were damaged owing to NaOH (Grade B 3ea, Grade C 1ea) during desalination. Thus, Clions are more stably released when sodium sesquicarbonate is used than when NaOH is used.