Case: Laser Cleaning in Fire-Gilding Restoration
案例：激光清洗用于鎏金层修复
标签：案例, 激光清洗, 文物修复, 鎏金, XRF检测
清代鎏金铜佛（高 45 cm）表面油污与绿锈覆盖，传统化学清洗易伤金层。采用 532 nm 绿激光（单脉冲 0.2–0.5 mJ、10 Hz）选择性清洗：绿光对金层反射率高、对锈蚀吸收强，逐点扫描后金层无损；局部露铜处以传统汞齐法小面积补鎏。清洗前后 XRF 检测金层厚度变化 <0.2 μm，为可移动文物鎏金修复提供了干式路线。
A Qing gilt bronze Buddha (45 cm) was masked by soil and green corrosion; chemical cleaning risked the gold layer. Selective cleaning with a 532 nm green laser (0.2–0.5 mJ, 10 Hz) exploited gold's high reflectance versus corrosion absorption—scanned spot by spot, the gilding was unharmed; small exposed-copper areas were re-gilded by traditional amalgam. XRF before/after showed <0.2 μm gold loss, offering a dry route for movable-heritage gilt restoration.