Why gold never tarnishes: Scientists find the secret on its surface

For thousands of years, humans have valued pure gold because it stays bright and shiny without becoming dull. Now, scientists have discovered that gold has a tiny self-protection system that actively stops oxygen from damaging its surface.The breakthrough comes from researchers at Tulane University, who found that atoms on the surface of gold automatically rearrange themselves into patterns that prevent chemical reactions. This natural shield slows oxidation by up to a trillion times, solving the long-standing mystery of why the precious metal resists tarnishing for generations.Publishing their findings in Physical Review Letters, the research team showed that gold's famous durability comes from the physical arrangement of its atoms, not just its chemistry.