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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.
When minting coins, especially low denomination coins, there is a risk that the value of metal within a coin is greater than the face value, leading to negative seigniorage. This leads to the possibility of smelters taking coins and melting them down for the scrap value of the metal.
Zinc refining is the process of purifying zinc to special high grade (SHG) zinc, which is at least 99.995% pure. [1] This process is not usually required when smelting of zinc is done through electrolysis processes, but is needed when zinc is produced by pyrometallurgical processes, because it is only 98.5% pure.
The zinc 5 Reichspfennig coin was minted by Nazi Germany between 1940 and 1944 during World War II, replacing the bronze-aluminium version, which had a distinct golden color. It was worth 1/20 or .05 of a Reichsmark , the same ratio of a modern-day five-cent piece (nickel) to one USD.
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The 2 + 1 ⁄ 2-cent coin minted in the Netherlands during World War II was made of zinc, and worth 1 ⁄ 40, or .025, of the Dutch guilder. It was designed by Nico de Haas , a Dutch national-socialist , and struck in 1941 and 1942.
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The 10 centimes coin was minted between 1941 and 1946, first by the Germans during the occupation of Belgium, and then by the Belgian government after World War II ended. The coin composed of 100% zinc, and was an emergency issue type. There are also two different varieties. Belgique-Belgie lettering
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