Green gold alloys are made by leaving the copper out of the alloy mixture and just using gold and silver. It actually appears as a greenish-yellow rather than green. Eighteen karat green gold would therefore contain a mix of 75% gold and 25% silver (or 73% gold and 27% silver). Fired enamels adhere better to these alloys.
Green gold was known to Lydians as long ago as 860 BC under the name electrum, a naturally-occurring alloy of silver and gold.
Cadmium can be added to gold alloys in amounts of up to 4% to achieve a green color. The alloy of 75% gold, 23% copper, and 2% cadmium yields light-green 18-karat gold. The alloy of 75% gold, 15% silver, 6% copper, and 4% cadmium yields a dark-green alloy. Cadmium is, however, highly toxic.
Read more about this topic: Red Gold
Famous quotes containing the words green and/or gold:
“Men like my father cannot die. They are with me still real in memory as they were in flesh. Loving and beloved forever. How green was my valley then.”
—Philip Dunne (1908–1992)
“There is, of course, a gold mine or a buried treasure on every mortgaged homestead. Whether the farmer ever digs for it or not, it is there, haunting his daydreams when the burden of debt is most unbearable.”
—Fawn M. Brodie (1915–1981)