German coins since 1871 - from Reichsmark to Euro
With the adoption of the constitution of the German Empire on April 16, 1871, responsibility for the currency of the empire passed from individual federal states to the government of…

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Grodno found an unusual coin and counts on tips coin collectors
Near the fenced construction site in the very center of Grodno Grodno resident Anatoly Pozharov found a coin, the history of which probably sends us a few centuries ago. On…

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Oriental coins (VII-XXI century)
The conquerors of the territories that previously belonged to Byzantium were not familiar with the coinage before the reign of Muhammad, and therefore the history of the Arab coinage begins…

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soda solution

Cleaning of old coins

The purpose of this message is to acquaint interested readers with the most simple and safe methods of cleaning coins, which the author can recommend based on his many years of experience in the restoration of an archaeological metal at the State Hermitage Museum. Clearing coins is one of the crucial types of restoration, it is important for their study, dating, identification and storage. Ancient coins made of silver and copper alloys, found in treasures or in other archaeological excavations, most often enter the restoration workshop highly corroded, and sometimes completely mineralized. Under the action of water and salts, copper is destroyed in the soil to form green carbonates and chlorides, red cuprous oxide and black oxide. Continue reading

Coins and coin type of ancient Greece
The stamp imprint on the coins is the seal of the country or city that issued it. The drawings and inscriptions on the coins represent the most important concept of…

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Cleaning of old coins
The purpose of this message is to acquaint interested readers with the most simple and safe methods of cleaning coins, which the author can recommend based on his many years…

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Greek coins (VII-II century BC)
In ancient Greece, the fundamental foundations of the development of European civilization were laid. The cultural achievements of the “classical time” (ca. 500-363 / 323 BC) include not only the…

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