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electrum

エレクトロン　—　Measuring

An alloy in which gold and silver are mixed by nature.

Electrum trite Electrum triteBC 610–560 Croeseid Croeseidc. BC 550
A photograph of the real thing this term names.

⚠ The earliest coins were made of this metal. As a natural alloy, the proportion of gold and silver is not constant. The problem of "not knowing the content just by looking" necessitated a guarantee by means of a stamp.