Answer
Sep 19, 2024 - 01:46 PM
To assay a gold bar, several methods can be used to verify its purity. The most common techniques include:
- Fire Assay: The gold is melted and combined with lead to separate impurities, providing a highly accurate purity measurement.
- X-Ray Fluorescence (XRF): This non-destructive method uses X-rays to determine the surface purity of the gold.
- Ultrasound: This method checks for consistency inside the bar by sending sound waves through it to detect any impurities or voids.
- Acid Test: A small sample is taken and exposed to acid to assess its purity, typically used for smaller items.
- Professional refineries or dealers usually perform these tests to ensure the gold's authenticity and purity.
