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alloy metal

割り金 ／ alloy-metal　—　Making

The cheap metal, such as copper, mixed into gold or silver.

Solidus of Constantine Solidus of Constantine320 AD Solidus of Justinian Solidus of Justinian538–545 AD Denaro of Lucca Denaro of Lucca11th–12th century
A photograph for the related word “fineness”.

Pure gold and silver are too soft to withstand daily use. Therefore, alloying is a necessary process. It only becomes a problem when the amount of base metal added exceeds what is necessary.