Inflation is the rate at which the general level of prices for goods and services is rising and, consequently, the purchasing power of currency is falling. Central banks attempt to limit inflation, and avoid deflation, in order to keep the economy running smoothly. Next Up.
If you are not allergic to metal, the reason for this reaction is chemical. It's due to a combination of the metal and the acids in your skin. Experts say that there are several metals that oxidize with your skin to give you a noticeable green ring around your finger. A ring made of copper is a common culprit, but even silver and gold metals can cause discoloration.
Originally Answered: Why do bronze and brass turn green? The green layer you see is called tarnish and forms when brass is exposed to the carbon and sulfur dioxides in the air. It's basically a thin layer of corrosion that forms and it can only be eliminated with a thorough cleaning which requires you to remove some of the surface and patina of the piece.