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  2. Gold parting - Wikipedia

    en.wikipedia.org/wiki/Gold_parting

    In the morning, however, take out the gold and melt it again, hammer it, and put it into the furnace as before. After another day and night take it out again, mix a little red copper with it, melt as before, and put it back into the furnace. And when you have taken it out a third time, wash it and carefully dry it.

  3. Granulation (jewellery) - Wikipedia

    en.wikipedia.org/wiki/Granulation_(jewellery)

    There are three basic techniques that may be used to attach granules to a metal surface: hard soldering, fusing and colloidal soldering. The metals used in granulation are usually gold and/or silver alloys of high purity – alloys below 18 kt. gold and sterling silver being unsuitable. With each technique, the process begins with the making of ...

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

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

    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. Cupellation - Wikipedia

    en.wikipedia.org/wiki/Cupellation

    16th century cupellation furnaces (per Agricola). Cupellation is a refining process in metallurgy in which ores or alloyed metals are treated under very high temperatures and subjected to controlled operations to separate noble metals, like gold and silver, from base metals, like lead, copper, zinc, arsenic, antimony, or bismuth, present in the ore.

  6. Costco gold bars are a hit with millennials? Not so fast

    www.aol.com/finance/costco-gold-bars-hit...

    The paper not only quotes two other thirtysomething buyers of Costco gold bars (three examples and you have a trend!) but cites a State Street study that finds the "average millennial allocates 17 ...

  7. Costco Now Sells Gold Bars: Here's How to Buy Them

    www.aol.com/costco-now-sells-gold-bars-160000656...

    Earlier this year, Costco started selling gold bars, solidifying their role as a true one-stop shop. If you're looking to get in on the Costco gold rush, there are a few things you should now.