I accidentally broke a copper coin. Found that its side is not the color of copper. Ask an expert. My copper coins are not fake, are they? It's from the Song Dynasty. ...

Hello! What do you mean it's not copper? If the copper coins in the Song Dynasty are not well preserved, copper oxidation may discolor and oxidize the copper coins that are not thick. Sometimes rust green or dark brown appears, which is normal! There are many ingots in Xianping, which are generally between 20 and 50 yuan in the market!