Group 1 - Iridium is a rare precious metal with a density close to that of gold, historically used to adulterate gold due to its similar properties [2] - The market situation has dramatically changed, with iridium's market price now significantly exceeding that of gold, reversing its previous role in gold adulteration [4] - Iridium, including iridium powder, titanium-coated iridium, and iridium alloy materials, has become highly valuable in the precious metal recycling market [6]