Gold-filled wire is made by having a layer of gold that is mechanically bonded with heat and pressure to another material, usually a base metal which is most commonly brass, which is then drawn through a series of tools and dies, until the final desired diameter of the wire is attained. Gold-filled wire is resistant to tarnishing because the outside layer is actually gold and is thick enough to prevent oxidation of the inner material. The gold content must be at least 1/20th of the total weight, where the gold itself is no less than 10 karat in purity.
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