Various colors of gold obtained by alloying gold with other elements
Ternary plot of different colors of Ag–Au–Cu alloys
Colored gold is the name given to any gold that has been treated using techniques to change its natural color. Pure gold is slightly reddish yellow in color,[1] but colored gold can come in a variety of different colors by alloying it with different elements.
Colored golds can be classified in three groups:[2]
Alloys with silver and copper in various proportions, producing white, yellow, green and red golds. These are typically malleable alloys.
Intermetallic compounds, producing blue and purple golds, as well as other colors. These are typically brittle, but can be used as gems and inlays.
Surface treatments, such as oxide layers.
Pure 100% (in practice, 99.9% or better) gold is 24 karat by definition, so all colored golds are less pure than this, commonly 18K (75%), 14K (58.5%), 10K (41.6%), or 9K (37.5%).[3]
^Encyclopædia of Chemistry, theoretical, Practical, and Analytical: As Applied to the Arts and Manufactures. J. B. Lippincott & Company. 1880. pp. 70–.
^Cretu, C.; Van Der Lingen, E. (1999). "Coloured gold alloys". Gold Bulletin. 32 (4): 115. doi:10.1007/BF03214796.
^Cite error: The named reference natbuild was invoked but never defined (see the help page).
Coloredgold is the name given to any gold that has been treated using techniques to change its natural color. Pure gold is slightly reddish yellow in...
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and accounts are not completely anonymous. A real "gold key" need not be made of or coloredgold, or even a key. If it is a key it may not fit any lock;...
same width. It bears the country's emblem as a charge in the center, coloredgold. Standard of the Sultan 3:2 version flag Flag of the Royal Army of Oman...
wine-colored "C" trimmed in gold on the front, names in gold letters on the back, wine-colored/gold-trimmed numbers on the front and back, and gold-colored...
toned, pure green with no secondary yellow hue or brown mask. Lighter-colored gems are due to lower iron concentrations. The molecular structure of peridot...
during the groundbreaking is often a special ceremonial shovel, sometimes coloredgold, meant to be saved for subsequent display and may be engraved. In other...
{\frac {(11+{\frac {2}{20}})}{12}}=92.5\%} silver. Coloredgold Electrum Gold as an investment Gold coin Platinum coin Silver as an investment Silver coin...
gum, as well as by celluloid and even glass. Baltic amber is sometimes colored artificially but also called "true amber". Amber occurs in a range of different...
gold alloys relatively poor in gold such as coloredgold can be easily oxidized and dissolved by nitric acid, leading to colour changes of the gold-alloy...
facsimile signature. The 20 July Wound Badge in gold had a silver background with the helmet and wreath coloredgold. Unlike the standard Wound Badges, these...
Brown gold may refer to: Coffee, a beverage made out of roasted coffee beans Chocolate, a drink made out of cocoa beans Brown coal, lignite Coloredgold Old...
1960s, the first paper on the subject was not published until 1996. Coloredgold Ductility Ferrous metallurgy Metal theft Metallurgy Metals of antiquity...
found alloyed with silver or other metals to produce various types of coloredgold. These metals were also used to strengthen each other, for more practical...
under the colored profile flaps on the cover. Overseas releases switched the cover art, with the band photo on the front, and the colored silhouettes...
ornaments, excluding flowers for example. For many centuries metal such as gold often combined with gemstones, has been the normal material for jewellery...
the Gold Trumpets, the fire pans for removing the ashes from the altar, and the Table of Showbread. These spoils were likely originally coloredgold, with...
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