How to Find Platinum and Silver Hiding in Piles of Mixed Scrap

Have you ever seen sparks flying when someone was using an arc welder or oxyacetylene welding torch? The sparks you see are little bits of molten metal that fall to the floor as powder and then cool. If silver is contained in the metals being bonded (or if it is contained in the rods used for brazing, as it often is), it will fall to the floor where it will be swept up – maybe by a young employee like I was, at the end of the day.