In a recent article Catalina Ponor talked about the medals she got at the 2004 Olympics in Athens and how they look today. Apparently, the medals now have black spots (I don’t know the word for it, ‘oxidize’ maybe?) and lost shine.
'I wish the medals still looked impeccable. They represent my hard work and I would’ve wanted them to remain perfect. All the medals from Greece oxidized (?). I’m really sorry. My mother was the one to notice it, she told me they turned black and ugly. When I returned home, I was shocked.I know that the same thing happened to my former team mates.’