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copper and gold alloy is a solid metal that can be used for a variety of applications. This alloy combines the best qualities of copper (Cu), silver (Ag) and gold (Au). CuAgAu alloys have unique characteristics including high strength, good corrosion resistance and excellent electrical conductivity. The proportion of these metals determines the overall property of the alloy and can be changed depending on the application.
Various mixtures of gold with copper have been made since antiquity, and in some instances the alloys were referred to as electrum. An ancient formula mixing 45% silver with 45% gold and 10% copper produced a hard, durable alloy known as Electrum that was used extensively for jewelry and coinage.
Gold-copper alloys tarnish in air and blacken when heated, owing to the oxidation of copper. This tarnish can be removed, without previous oxidation, by plunging the alloy in dilute acids or alkaline solutions. The method is known as blanching, and it was formerly employed by French jewelers to produce a brighter gold surface. Nitric acid dissolves out the copper in such alloys, and sulphuric and aqua regia remove it completely.
In some cases, a gold-copper alloy is used in the manufacture of jewelry because it can be easily worked and wrought. In addition, it is very resistant to corrosion and can withstand the high temperatures associated with casting and melting. copper and gold alloy is also commonly used in electronic components and medical devices because it provides the best combination of strength and corrosion resistance.