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  2. Sterling silver - Wikipedia

    en.wikipedia.org/wiki/Sterling_silver

    The colonies lacked an assay office during this time (the first would be established in 1814), so American silversmiths adhered to the standard set by the London Goldsmiths Company: sterling silver consisted of 91.5–92.5% by weight silver and 8.5–7.5 wt% copper. [12]

  3. This Is Why Your Skin Turns Green After Wearing Certain ... - AOL

    www.aol.com/why-skin-turns-green-wearing...

    The good news: there are still ways to wear your favorite pieces of jewelry. The post This Is Why Your Skin Turns Green After Wearing Certain Jewelry appeared first on Reader's Digest.

  4. Silver - Wikipedia

    en.wikipedia.org/wiki/Silver

    Under standard conditions, silver does not form simple carbonyls, due to the weakness of the Ag–C bond. A few are known at very low temperatures around 6–15 K, such as the green, planar paramagnetic Ag(CO) 3, which dimerises at 25–30 K, probably by forming Ag–Ag bonds. Additionally, the silver carbonyl [Ag(CO)] [B(OTeF 5) 4] is known.

  5. Chemical coloring of metals - Wikipedia

    en.wikipedia.org/wiki/Chemical_coloring_of_metals

    They are bronze casts with some silver-colored parts, which originate from the Anatolian region. [2] Similar processes can be found on some ancient Egyptian copper sheets. [3] Another example of early chemical coloring of metals is the Nebra sky disk, which has a green patina and gold inlays. An early example of black colored iron is the famous ...

  6. Verdigris - Wikipedia

    en.wikipedia.org/wiki/Verdigris

    The Statue of Liberty, showing advanced patination; verdigris is responsible for the statue's iconic green colour.. Verdigris (/ ˈ v ɜːr d ɪ ɡ r iː (s)/) [1] is a common name for any of a variety of somewhat toxic [2] [3] [4] copper salts of acetic acid, which range in colour from green to a bluish-green depending on their chemical composition.

  7. Silver standards - Wikipedia

    en.wikipedia.org/wiki/Silver_standards

    Ninety-one (91) zolotniks have the equivalent millesimal fineness of 947[9]. Thus, the alloy contains 94.79% pure silver and 5.21% copper or other metals. [4] [5] Sterling silver has a millesimal fineness of 925. The sterling silver alloy is 92.5% pure silver and 7.5% copper or other metals.

  8. Patina - Wikipedia

    en.wikipedia.org/wiki/Patina

    Patina also refers to accumulated changes in surface texture and color that result from normal use of an object such as a coin or a piece of furniture over time. [3] Archaeologists also use the term patina to refer to a corticated layer that develops over time that is due to a range of complex factors on flint tools and ancient stone monuments. [1]

  9. Talk:Sterling silver - Wikipedia

    en.wikipedia.org/wiki/Talk:Sterling_silver

    The pound sterling in Edward III's time had a proportion of silver to copper of 224:16 which corresponds to 14/15 = 0.93333 parts silver. By 1716 the relative amounts of silver to copper were 222:18 or 222/240 = 0.925 parts silver. It would be interesting to find out when the 925 standard was introduced.