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Electrum is a naturally occurring alloy of gold and silver, with trace amounts of copper and other metals. Colour ranges from pale to bright yellow, depending on the proportions of gold and silver. Gold content of naturally occurring electrum in modern Western Anatolia ranges from 70% to 90% in contrast to the 45-55% of electrum used in ancient Lydian coinage of the same geographical area. 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 was also used in the making of ancient drinking vessels and coins. Electrum consists primarily of gold, platinum, and silver but is sometimes found with traces of copper and other metals. As a result, electrum is a good conductor of electricity.
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