Electrum n. : Amber.

Electrum n. : An alloy of gold and silver, of an amber color, used by the ancients.

Electrum n. : German-silver plate. See German silver, under German.

Example:
What amounts of gold and silver make up the old alloy Electrum?

Taxonomy
electrum, coin, stater, gold, silver coins, composition, coinage, gram, Lydian, gold content, silver, free encyclopedia, white gold, 14.1, metals, denomination, gold and silver, gold coinage.

Defination from the web:
Electrum was used as early as the third millennium BC in Old Kingdom Egypt, sometimes as an exterior coating to the pyramidions atop ancient Egyptian pyramids and obelisks. ... Electrum consists primarily of gold and silver but is sometimes found with traces of platinum, copper and other metals. ...