Bronze is a combination of copper and tin. This is the reason why it is prone to developing an undesirable coating in time. While some may find this darker, sometimes greenish patina charming and a true testament of history and use, others may prefer the original look of bronze: shiny, polished and flawless. If you are in the latter team, then you will be pleased to know that one of the main reasons why bronze is a popular metal is that you don’t have to exert a lot of effort cleaning it.