https://vm-vision.eu/nl/toepassingen/edelemetalen1/ https://vm-vision.eu/nl/toepassingen/edelemetalen1/ sounds interesting to detect these. "X-ray fluorescence

https://vm-vision.eu/nl/toepassingen/edelemetalen1/ https://vm-vision.eu/nl/toepassingen/edelemetalen1/ sounds interesting to detect these. "X-ray fluorescence is a very reliable way to confirm the purity, but XRF is a surface technique. Some precious metals processors have even resorted to drilling or cutting bars to verify integrity. However, a simple ultrasonic test can quickly and reliably locate inserts with no need to drill, cut, or otherwise alter the bar."