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.
Copper is a pinkish colour when it is new, but soon turns a reddish orange color after it is exposed to air. Copper is one of the few coloured metals. Most metals are gray or silver. Gold, copper, caesium and osmium are the only four coloured metals. Copper is green as copper(II) carbonate and copper(II) hydroxide. It turns green because it oxidises. After a time in the air, copper forms green copper carbonate at the surface, called verdigris. That is why the copper roof of a building looks green. Copper is very flexible and ductile. It can be stretched into wires easily. Copper is also very soft, it has a Mohs hardness of 2.5 to 3.