Plural of electrum; multiple samples or types of the gold-silver alloy.
From electrum + -s (plural). The plural form, used in metallurgical and historical contexts when discussing multiple specimens or compositions of this ancient alloy.
Different ancient electrums had wildly different gold-to-silver ratios—early Lydian coins were 55% silver and 45% gold, while later versions were almost all silver, making them lighter and cheaper to produce.
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