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.
Interesting Facts about Nickel. 1  The U.S. five cent coin, the nickel, is composed of 75% copper and 25% nickel. 2  It is the second most abundant element in the Earth's core after iron. 3  Nickel plays a role in the cells of plants and some microorganisms. 4  It is sometimes added to glass to give it a green color.