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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. 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

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. 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 ...

6. 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 ...

7. Colored gold - Wikipedia

   en.wikipedia.org/wiki/Colored_gold

   A surface plating of blue gold on karat gold or sterling silver can be achieved by a gold plating of the surface, followed by indium plating, with layer thickness matching the 1:2 atomic ratio. A heat treatment then causes interdiffusion of the metals and formation of the required intermetallic compound.

8. Gold-filled jewelry - Wikipedia

   en.wikipedia.org/wiki/Gold-filled_jewelry

   The Federal Trade Commission allows the use of the terms "rolled gold plate," "R.G.P" or "gold overlay" on items with lower thicknesses of gold than are required for "gold-filled." [ 3 ] An example would be an item stamped as " 1 ⁄ 40 10kt RGP" meaning that the object is plated with 10kt gold at a thickness that makes weight of the plated ...

9. Hydrogen embrittlement - Wikipedia

   en.wikipedia.org/wiki/Hydrogen_embrittlement

   ASTM F519 is the Standard Test Method for Mechanical Hydrogen Embrittlement Evaluation of Plating/Coating Processes and Service Environments. There are 7 different samples designs and the two most commons tests are (1) the rapid test, the Rising step load testing (RSL) method per ASTM F1624 and (2) the sustained load test, which takes 200 hours ...