Gold comes in a number of colors aside from 'gold'. It can be white, rose, green, purple, blue, or black. Ever wonder what gives gold it's colors? Well, here it is.
White gold is very popular right now. It can be in 18-karat or 14-karat gold (but not in 22-karat, as it is yellow gold). There are two basic types of white gold alloys: white gold mixed with nickel and white gold mixed with palladium. Nickel can be mixed with gold to create a white or gray color, but some people have an allergy to nickel. Palladium is another metal used to create white gold. Palladium is better but it costs more.
Rose gold and Green gold can be 18-karat or 14-karat but the color is stronger in the 14-karat alloys. Rose gold is obtained by mixing the gold with copper, often in a 75% gold, 25% copper ratio. Green gold has no copper and is usually 75% gold, 25% silver ratio.
Purple gold is referred as amethyst or violet gold. Purple gold is obtained by mixing gold and aluminium in a certain fixed ratio. Gold content is almost 79% and therefore it is qualified to be referred to as 18K gold.
Blue gold is made as an inter-metallic compound between gold and indium . The gold gets a bluish hue color with this process.
Black gold is created using a few techniques. Electro-deposition using black rhodium or ruthenium is the first technique. Controlled oxidation of Carat gold containing cobalt or chromium can also be made to create black gold. Amorphous carbon is also used some times, with the Plasma Assisted Chemical Vapor
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July 06, 2010 at 18:32:06
I am not really familiar with Gold. So, it is really nice to know about each color.
November 30, 2010 at 22:16:30
I really like what you write in this post, It really gave me lots of information about what I need, Thank you!