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Bronze disease is the chloride corrosion of cuprous (copper-based) artifacts. It was originally thought to be caused by bacteria. [ 1 ] It is contagious in that the chlorides which cause it can spread the condition if they are brought into contact with another cuprous object. Despite its name, bronze disease can affect any copper-bearing alloy ...
A Byzantine follis of Constantine VII and Zoe. 914-919AD. 26 mm. The term "follis" is used for the large bronze coin denomination (40 nummi) introduced in 498, with the coinage reform of Anastasius, which included a series of bronze denominations with their values marked in Greek numerals. The fals (a corruption of follis) was a bronze coin ...
Gold, silver and bronze or copper were the principal coinage metals of the ancient world, the medieval period and into the late modern period when the diversity of coinage metals increased. Coins are often made from more than one metal, either using alloys, coatings (cladding / plating) or bimetallic configurations.
Rome, Florence, and Venice followed with coins of denominations greater than a penny, and late in the 12th century Venice minted a silver coin equal to 24 pennies. By the mid-13th century Florence and Genoa were minting gold coins, effectively ending the reign of the silver penny ( denier , denarius ) as the only circulating coin in Europe.
Renaissance Wax is also commonly used in the preservation of bronze and copper coins. The wax seals the coins and helps prevent deterioration from moisture and air exposure. It may [citation needed] also help prevent the onset of the chloride-related corrosion commonly called bronze disease, although it won't arrest this once started.
The penny of Great Britain and the United Kingdom from 1714 to 1901, the period in which the House of Hanover reigned, saw the transformation of the penny from a little-used small silver coin to the bronze piece recognisable to modern-day Britons. All bear the portrait of the monarch on the obverse; copper and bronze pennies have a depiction of ...
The coins of the well-known king Gentius are scarce in comparison to the coins of Ballaios. His silver issues are rare, but bronze coins (without the royal title) occur on Hvar in Croatia, both in single finds and in hoards, and at Rhizon, the ancient capital of Queen Teuta, in a different series bearing the royal title. The coins of Ballaios ...
Jubilee coinage. The Jubilee coinage or Jubilee head coinage are British coins with an obverse featuring a depiction of Queen Victoria by Joseph Edgar Boehm. The design was placed on the silver and gold circulating coinage beginning in 1887, and on the Maundy coinage beginning in 1888. The depiction of Victoria wearing a crown that was seen as ...
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