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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 ...
This cash coins has rather broad rims. 大觀通寶 (Daguan Tongbao) 中 (Zhong) The "中" is written in seal script and is above the square center hole on the reverse. 大觀通寶 (Daguan Tongbao) 半錢 (Ban Qian) The reverse inscription indicates that this cash coin had a nominal value of half a qián of silver.
A bronze doit of the Dutch East India Company, depicting the VOC monogram and its date of production on its obverse and the coat of arms of Holland on the reverse.. The Dutch East India Company (Dutch: Vereenigde Oostindische Compagnie, often known as VOC) was a chartered company which issued a considerable series of coinage in bronze, silver and gold for its territories in the Far East ...
Verdigris is a naturally occurring protective layer on metals such as copper, brass, and bronze. In addition to be a desirable artistic effect, it has been used primarily as a pigment and now-outdated medicinal preparations. When burned, verdigris produces a green flame. [ 23 ]
In 1795-1797, a scrawny, naturalistic bald eagle was depicted on the reverse side of all silver coins. This design is known as Draped Bust, Small Eagle and usually commands a high price due to the extremely low mintage at the time. In 1798, the small eagle was replaced by the Heraldic eagle. This design is known as Draped Bust, Heraldic Eagle.
Contact with the Greeks had prompted a need for silver coinage in addition to the bronze currency that the Romans were using at that time. This predecessor of the denarius was a Greek-styled silver coin of didrachm weight, which was struck in Neapolis and other Greek cities in southern Italy. [4]
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 issued by the Umayyad and Abbasid caliphates beginning in the late ...
Design date. 2009–present. The Sacagawea dollar (also known as the " golden dollar ") is a United States dollar coin introduced in 2000, but subsequently minted only for niche circulation from 2002 onward. The coin generally failed to meet consumer and business demands. It is still generally accepted in circulation.