All United States and most foreign countries gold coins were 90 percent gold (22 karat). Since pure gold is soft, it is unsuitable for use as coinage, hence a 10 percent hardening alloy was added, usually copper, to make coins more durable. Some …
All United States and most foreign countries gold coins were 90 percent gold (22 karat). Since pure gold is soft, it is unsuitable for use as coinage, hence a 10 percent hardening alloy was added, usually copper, to make coins more durable. Some …
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