Brass Turn Your Skin Green

It might. It is the copper in brass and bronze that might cause your skin to turn green, and this likelihood is increased if your jewelry comes in contact with water. As such, if you’re wearing a brass ring, it is most likely to leave a green mark on your skin when you sweat or wash your hands. This is generally not harmful or painful (it is just oxidation of the metal) and will go away within a few hours of removal. If you absolutely hate it, you can put a thin layer of clear nail polish on the part of your jewelry that touches your skin and you will not have this issue. Note that you will not have this issue with gold-plated brass. The gold (or rose gold) plating keeps the brass from making direct contact with your skin.