Copperygold

Copperygold is a term used to describe a copper–gold alloy composed of copper and gold in varying ratios. It is not a widely standardized alloy in metallurgy and the name may be used by jewelers or artisans to market a warm, golden-hued material. Depending on the composition and finishing, the alloy can range from reddish coppery to bright yellow-gold in appearance.

Typical formulations place gold at 10–30 percent by weight, with the remainder copper, though some sources describe wider ranges. The color shifts from coppery red with lower gold content to a more yellow-gold shade as gold content rises. Added gold improves corrosion resistance and reduces the tendency to tarnish relative to pure copper, while higher copper content imparts strength and a reddish hue. Mechanical properties depend on processing and can include good ductility and formability.

Manufacture and processing: to produce copperygold, copper and gold are melted in proper proportions, combined, and then cast or rolled into desired shapes. Homogenization heat treatments and cold working followed by annealing can tailor grain structure, hardness, and ductility. The alloy can be finished by polishing, electroplating, or patination to achieve various aesthetics.

Applications and considerations: used mainly in decorative jewelry, art objects, and awards where a warm gold-like appearance is desired at lower cost than pure gold or high-karat gold alloys. Because gold is expensive, copperygold remains a niche material with limited use in commercial electronics or industrial engineering. Availability depends on supplier and region.

See also: electrum.