If you want to know why pure gold will rust? First of all, what is the rust on the surface of a thousand solid gold?



National Jewelry, Jade and Precious Metals Testing Center on the gold surface of the "rust" phenomenon made a description: red or white spots on the surface of gold, gold jewelry in daily life is a common phenomenon, belongs to the production process, production workshop or mold dust, after the imprint is easy to appear on the finished product red spots. And because the surface treatment of gold jewelry has become more and more complex, its uneven surface is easier to hide dirt and dirt, gold storage environment is relatively wet and other objective factors, will cause the phenomenon of gold "rust". So it's not the gold that rusts, it's the dust on the surface.