Memes! on Instagram: "@sdbullion Green corrosion hiding under the gold plating is one of the easiest ways to spot a fake. Real gold doesn’t oxidize, fade, or turn your skin green — but cheap plated metals do. Once the outer layer starts wearing off, the base metal reacts with moisture and air, creating that green tint that exposes the fraud instantly. If you ever see discoloration like this on a “gold” bar or coin, it’s already telling you everything you need to know."