Drilling a sample from a statuette. In this case, a 1 mm diameter steel bit was used, drilling to a depth of 1 cm into the base. The metal drillings are collected on clean paper and carefully sorted under magnification to avoid any contamination by dust and/or corrosion products. Five-Headed and Ten-Armed Śiva, Angkor, 13th century, H. 38.5 cm (National Museum of Cambodia, inv. Ga 2778).