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Bi-metallic coins are coin
Coin

A coin is a piece of hard material, usually metal or a metallic material, usually in the shape of a Disk , and most often issued by a government....
s consisting of more than one metal
Metal

In chemistry, a metal is a chemical element whose atoms readily lose electrons to form positive ions , and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms....
 or alloy
Alloy

An alloy is a partial or complete solid solution of one or more chemical element in a metallic matrix. Complete solid solution alloys give single solid phase microstructure, while partial solutions give two or more phases that may be homogeneous in distribution depending on thermal history....
, generally arranged with an outer ring around a contrasting center. Common circulating examples include the €1
1 euro coins

1 euro coins are made of two alloys: the inner part of cupronickel, the outer part of nickel brass. All coins have a common reverse side and country-specific national sides....
, €2
2 euro coins

Image:2e comm.png|Common side of all ?2 coins minted before 2007Image:EUR 2 .png|Common side of all ?2 coins minted from 2007 onwards...
, British £2, Canadian $2 and South African R5
South African rand

The rand is the currency of South Africa. It takes its name from the Witwatersrand , the ridge upon which Johannesburg is built and where most of South Africa's gold deposits were found....
.

Bi-metallic coins have been issued for a long time, with examples known dating from the 1600s, while the Roman Empire issued special occasion, large medallions with a center of bronze or copper and an outer ring of orichalcum
Orichalcum

Orichalcum is a metal mentioned in several ancient writings, most notably the story of Atlantis as recounted in the Critias dialogue, recorded by Plato....
, starting with the reign of Hadrian
Hadrian

Publius Aelius Hadrianus , as emperor Imperator Caesar Divi Traiani filius Traianus Hadrianus Augustus, and Divus Hadrianus after his apotheosis, known as Hadrian in English language, was Roman Emperor of Roman Empire from AD 117 to 138, as well as a Stoicism and Epicureanism philosopher....
.






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Bi-metallic coins are coin
Coin

A coin is a piece of hard material, usually metal or a metallic material, usually in the shape of a Disk , and most often issued by a government....
s consisting of more than one metal
Metal

In chemistry, a metal is a chemical element whose atoms readily lose electrons to form positive ions , and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms....
 or alloy
Alloy

An alloy is a partial or complete solid solution of one or more chemical element in a metallic matrix. Complete solid solution alloys give single solid phase microstructure, while partial solutions give two or more phases that may be homogeneous in distribution depending on thermal history....
, generally arranged with an outer ring around a contrasting center. Common circulating examples include the €1
1 euro coins

1 euro coins are made of two alloys: the inner part of cupronickel, the outer part of nickel brass. All coins have a common reverse side and country-specific national sides....
, €2
2 euro coins

Image:2e comm.png|Common side of all ?2 coins minted before 2007Image:EUR 2 .png|Common side of all ?2 coins minted from 2007 onwards...
, British £2, Canadian $2 and South African R5
South African rand

The rand is the currency of South Africa. It takes its name from the Witwatersrand , the ridge upon which Johannesburg is built and where most of South Africa's gold deposits were found....
.

Bi-metallic coins have been issued for a long time, with examples known dating from the 1600s, while the Roman Empire issued special occasion, large medallions with a center of bronze or copper and an outer ring of orichalcum
Orichalcum

Orichalcum is a metal mentioned in several ancient writings, most notably the story of Atlantis as recounted in the Critias dialogue, recorded by Plato....
, starting with the reign of Hadrian
Hadrian

Publius Aelius Hadrianus , as emperor Imperator Caesar Divi Traiani filius Traianus Hadrianus Augustus, and Divus Hadrianus after his apotheosis, known as Hadrian in English language, was Roman Emperor of Roman Empire from AD 117 to 138, as well as a Stoicism and Epicureanism philosopher....
. The silver-center cent pattern
Pattern coin

A pattern coin is a coin produced for the purpose of evaluating a proposed coin design, but which was not approved for general circulation. They are often off-metal strikes, to proof standard or piedforts....
 produced by the United States
United States

The United States of America is a Federal government constitutional republic comprising U.S. state and a federal district. The country is situated mostly in central North America, where its Contiguous United States and Washington, D.C., the Capital districts and territories, lie between the Pacific Ocean and Atlantic Oceans, Borders of the U...
 in 1792 is another example. In recent times, the first circulating bi-metallic coin was the 500 Italian lire
Italian lira

The lira was the currency of Italy between 1861 and 2002. Between 1999 and 2002, the Italian lira was officially a ?national subunit? of the euro....
, first issued in 1982. France, with a 10 franc
French franc

The franc is a former currency of France. Between 1360 and 1641, it was the name of coins worth 1 livre tournois and it remained in common parlance as a term for this amount of money....
 coin and Thailand, with a 10 baht
Thai baht

The baht is the currency of Thailand. It is subdivided into 100 satang . The issuance of currency is the responsibility of the Bank of Thailand....
, issued bi-metallic coins for circulation in 1988.

As well as circulating coins, where they are generally restricted to high denomination coins, bi-metallic coins are often used in commemorative issues
Commemorative coin

Commemorative coins are coins that were issued to commemorate some particular event or issue. Most world commemorative coins were issued from the 1960s onward, although there are numerous examples of commemorative coins of earlier date....
, they are used as a way of securing against Coin counterfeiting
Coin counterfeiting

Coin counterfeiting occurs regularly in the antique coin market, but there are various modern forgeries that make it into general circulation.Counterfeit antique coins are generally made to a very high standard so that they can fool collectors; this is not easy and many coins still stand out....
.

The manufacturing process is similar to that of ordinary coins, except that two blanks (the inner and the outer) are struck at the same time, deforming the separate blanks sufficiently to hold them together.

Countries




External links

Bi-metallic coin collectors' website