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:
“The question of whether it’s God’s green earth is not at center stage, except in the sense that if so, one is reminded with some regularity that He may be dying.”
—Edward Hoagland (b. 1932)
“The enquiring fields, courtesies
And tribulations of the air
Be still and give them peace:
The girl in the gold hair
With her young man in clover
In shadow of the day’s glare ...”
—Allen Tate (1899–1979)