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  2. Gold plating - Wikipedia

    en.wikipedia.org/wiki/Gold_plating

    Gold plated - gold layer thickness greater than or equal to 0.5 micron; Heavy gold plated / Vermeil - gold layer thickness greater than or equal to 2.5 micron; Gold plated silver jewellery can still tarnish as the silver atoms diffuse into the gold layer, causing slow gradual fading of its color and eventually causing tarnishing of the surface ...

  3. Jewellery cleaning - Wikipedia

    en.wikipedia.org/wiki/Jewellery_cleaning

    Another issue is the age of jewelry, as certain materials or build strategies of older jewelry (such as from the Georgian era) may have restrictions, such as not being able to get wet without damage. Keeping your jewelry clean gives the gemstone(s) a good shiny appearance by removing dirt and grease (among others) from loosening them.

  4. Conservation and restoration of silver objects - Wikipedia

    en.wikipedia.org/wiki/Conservation_and...

    Whether silver plating or pure silver, the composite of the metal will tarnish when exposed to air and sulfur. Tarnish is a chemical reaction on the surface of metal (copper, brass, silver, etc.) and causes a layer of corrosion. In the case of silver tarnish, the silver combines with sulfur and forms silver sulfide (Ag 2 S), which is

  5. How to Clean Gold Jewelry, According to a Professional Jeweler

    www.aol.com/lifestyle/clean-gold-jewelry...

    Gold jewelry is beautiful, durable and relatively easy to maintain. That said, not all gold is created equal and even the solid (i.e., not gold-plated) stuff requires an occasional polish. Without

  6. How To Clean Copper For Tarnish-Free Shine - AOL

    www.aol.com/lifestyle/clean-copper-tarnish-free...

    Keep your copper bright and shiny with our step-by-step guide.

  7. Tarnish - Wikipedia

    en.wikipedia.org/wiki/Tarnish

    Tarnish does not always result from the sole effects of oxygen in the air. For example, silver needs hydrogen sulfide to tarnish, although it may tarnish with oxygen over time. It often appears as a dull, gray or black film or coating over metal. Tarnish is a surface phenomenon that is self-limiting, unlike rust. Only the top few layers of the ...

  8. Galvanic corrosion - Wikipedia

    en.wikipedia.org/wiki/Galvanic_corrosion

    Nickel, solid or plated; titanium and its alloys; monel: −0.30 Copper, solid or plated; low brasses or bronzes; silver solder; German silvery high copper-nickel alloys; nickel-chromium alloys: −0.35 Brass and bronzes: −0.40 High brasses and bronzes: −0.45 18%-chromium-type corrosion-resistant steels: −0.50 Chromium plated; tin plated ...

  9. How to Clean Copper: 3 Methods That Actually Work - AOL

    www.aol.com/entertainment/clean-copper-3-methods...

    Copper is an excellent conductor of heat, which is why this metal is so prized when it comes to cookware. Plus, its rose-gold hue scores serious points in terms of aesthetic appeal—assuming the ...

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