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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 ...
The Ptolemaic dynasty introduced standard coinage to Egypt, where pre-existing native dynasties made only very limited use of coins. Egyptian gold stater was the first coin ever minted in ancient Egypt around 360 BC during the reign of pharaoh Teos of the 30th Dynasty. These coins were used to pay salaries of Greek mercenaries in his service.
Coin cleaning is the controversial process of removing undesirable substances from a coin's surface in order to make it more attractive to potential buyers. The subject is disputed among the numismatic community whether cleaning coins is necessary. Those that argue in favor of cleaning are also in dispute on which methods work best.
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. While coins are primarily made ...
Renaissance Wax is a brand of microcrystalline wax polish used in antique restoration and museum conservation around the world. Commonly used to polish and conserve metal objects, it is also used on gemstones and such organic materials as wood, ivory, and tortoiseshell. The product is sometimes used by reenactors to protect armor and weapons.
The coins comprise 67 separate types, and date from the period 253 to 305. The vast majority of coins are made from bronze, but five are made from solid silver. [15] Of the 52,503 coins found, 44,245 have been identified, and the remainder are classified provisionally as "illegible" until cleaning and conservation has been completed. [1]
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 ...
For the systematic study of currency, see Numismatics. A coin collection, featuring coins loose and in various storage mediums. Coin collecting is the collecting of coins or other forms of minted legal tender. Coins of interest to collectors include beautiful, rare, and historically significant pieces.