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  2. Jewellery cleaning - Wikipedia

    en.wikipedia.org/wiki/Jewellery_cleaning

    Keeping your jewelry clean gives the gemstone(s) a good shiny appearance by removing dirt and grease (among others) from loosening them. Dirty jewelry may also cause skin irritation. [1] A professional cleaning may take anywhere from a few minutes to a few days depending on the circumstances.

  3. 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 ...

  4. 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

  5. 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 ...

  6. Jewelry hygiene - Wikipedia

    en.wikipedia.org/wiki/Jewelry_hygiene

    The only exception is a plain gold wedding band. Jewelry hygiene expert David Bellman reacted to the announcement a few days later stating "This new policy change in long over due; in 2014, 1 in 6 Americans experienced some form of food poisoning and based on our research, contaminated jewelry is clearly playing a meaningful role."

  7. Colored gold - Wikipedia

    en.wikipedia.org/wiki/Colored_gold

    Gold content in AuAl 2 is around 79% and can therefore be referred to as 18 karat gold. Purple gold is more brittle than other gold alloys (called the "purple plague" when it forms and causes serious faults in electronics [14]), as it is an intermetallic compound instead of a malleable alloy, and a sharp blow may cause it to shatter. [15]

  8. 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

  9. Gilding - Wikipedia

    en.wikipedia.org/wiki/Gilding

    Gilding gives an object a gold appearance at a fraction of the cost of creating a solid gold object. In addition, a solid gold piece would often be too soft or too heavy for practical use. A gilt surface also does not tarnish as silver does. Modern gilding is applied to numerous and diverse surfaces and by various processes.

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