Answer
Sep 19, 2024 - 01:47 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.
