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  2. Jewellery cleaning - Wikipedia

    en.wikipedia.org/wiki/Jewellery_cleaning

    The cleaner would first inspect the jewelry to ensure that the gemstones are accounted for and secured. Materials that can handle it are often placed in an ultrasonic bath using a cleaning solution and later put through a steam cleaner, while more sensitive materials will go through light brushing in soapy water.

  3. How to Clean All the Rings in Your Jewelry Box, From Silver ...

    www.aol.com/lifestyle/clean-rings-jewelry-box...

    Gold is timeless and durable, but over time, it can accumulate oils, dirt, and scratches. Luckily, cleaning gold is simple and doesn't require too much effort. Materials Needed: Mild dish soap ...

  4. Vitreous enamel - Wikipedia

    en.wikipedia.org/wiki/Vitreous_enamel

    The powder melts, flows, and then hardens to a smooth, durable vitreous coating. The word vitreous comes from the Latin vitreus, meaning "glassy". Enamel can be used on metal, glass, ceramics, stone, or any material that will withstand the fusing temperature. In technical terms fired enamelware is an integrated layered composite of glass and ...

  5. Jet (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Jet_(gemstone)

    Jet is a type of lignite, [1] the lowest rank of coal, and is a gemstone.Unlike many gemstones, jet is not a mineral, but is rather a mineraloid. [2] It is derived from wood that has changed under extreme pressure.

  6. Superhard material - Wikipedia

    en.wikipedia.org/wiki/Superhard_material

    A wide array of rhenium borides have been investigated including Re 3 B, Re 7 B 3, Re 2 B, ReB, Re 2 B 3, Re 3 B 7, Re 2 B 5, ReB 3 and ReB 2. Each of these materials has their own set of properties and characteristics. Some show promise as superconductors and some have unique elastic and electronic properties, but the most relevant to ...

  7. Brinell hardness test - Wikipedia

    en.wikipedia.org/wiki/Brinell_hardness_test

    Brinell hardness numbers Material Hardness Softwood (e.g., pine) 1.6 HBS 10/100 Hardwood: 2.6–7.0 HBS 10/100 Lead: 5.0 HB (pure lead; alloyed lead typically can range from 5.0 HB to values in excess of 22.0 HB) Pure Aluminium: 15 HB Copper: 35 HB Hardened AW-6060 Aluminium: 75 HB Mild steel: 120 HB 18–8 (304) stainless steel annealed: 200 ...