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:
“There was a green branch hung with many a bell
When her own people ruled this tragic Eire;
And from its murmuring greenness, calm of Faery,
A Druid kindness, on all hearers fell.”
—William Butler Yeats (1865–1939)
“As I have known them passionate and fine,
The gold for which they leave the golden line
Of lyric is a golden light divine,
Never the gold of darkness from a mine.”
—Robert Frost (1874–1963)