Oxide Finish

An oxide finish is accomplished when a black finish is applied to metal. Sometimes the entire surface is coated and, for a different effect, the high areas are rubbed off leaving the oxidation in the engraving or embossing. This can be achieved by using a liver of sulfur or platinum chloride dip.

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Brightly Polished 14 Karat Yellow Gold Neo-Classic Style Bezel Earrings, Highlighted with Ruby Cabochons are the Frames for the Pair of Replica Ancient Coins Encased. The Coins, Having an Oxidized Finish, Depict the Profile of a Greco-Roman Emperor.
Image Courtesy of Lang Antiques.