Jewelry
Gold plating of silver is used in the manufacture of jewelry. Like copper, silver atoms diffuse into the gold layer, causing slow gradual fading of its color and eventually causing tarnishing of the surface. This process may take months and even years, depending on the thickness of the gold layer. A barrier metal layer is used to counter this effect. Copper, which also migrates into gold, does so more slowly than silver. The copper is usually further plated with nickel. A gold-plated silver article is usually a silver substrate with layers of copper, nickel, and gold deposited on top of it.
Read more about this topic: Gold Plating
Famous quotes containing the word jewelry:
“The demonstrations are always early in the morning, at six o’clock. It’s wonderful, because I’m not doing anything at six anyway, so why not demonstrate?... When you’ve written to your president, to your congressman, to your senator and nothing, nothing has come of it, you take to the streets.”
—Erica Bouza, U.S. jewelry designer and social activist. As quoted in The Great Divide, book 2, section 7, by Studs Terkel (1988)