In some parts of the world where there are many allies and major trading partners the various nations have standardized their coinage as much as possible by adopting standard coin denominations and weights, even though each nation has it own coin names and designs, the coins in some areas are freely used in trade and commerce. These nations, along with their dwarven neighbors have agreed on standards of purity and composition for the alloys and metals used for coins and it greatly facilitates commerce. This standardization is gradually spreading as the price of joining in the trade and commercial growth.
The nation by nation coin designs for the Obverse and Reverse sides, the Edge and the Rim are very important because clipped coins are not legal tender and when found are forfeit and must be re-melted and re-struck. Non-standard coins and metals obtained in treasure hoards by adventurers must be sold, after testing and replaced with approved coinage and or trade bars. Trade bars are used for higher value transactions and for banking of large sums of money.
In the majority of the world there is no standardization of coinage and transactions are more based on the amount of precious metal and tests for purity. The most common metals for coins are sliver, copper, brass and bronze. Much less common is gold and rarely platinum and palladium.
Coins in the standardized areas start with at least 99.9% purity and then is mixed in the case of silver, gold, platinum and palladium as follows 9 parts precious metal and 1 part copper, for the purpose of strength and to reduce coin wear. This is standard and acceptable for the agreed values.
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