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https://www.wirejewelry.com/jewelry-making-blog/7943/gold-filled-meaning/
Aug 08, 2012 · The modern gold filled wire and sheet metal technique was discovered in 1817 by John Turner, an Englishman, who patented his discovery.
https://www.myclassicjewelry.com/blog/vintage-gold-jewelry/
Apr 04, 2016 · Vintage gold jewelry was produced during the World War II era, but it’s more common to see Vermeil jewelry instead of plated jewelry from that period because the base metals used with plated jewelry were needed for the war effort. Gold Filled Vintage Jewelry
https://www.liveabout.com/what-does-gold-filled-mean-2043648
Mar 01, 2018 · Rolled gold—The term rolled gold is used interchangeably with the term gold filled with antique jewelry, but nowadays, rolled gold indicates that the jewelry has less than 5% gold content.These pieces have significantly more gold than gold plated items but not quite as much as gold filled items. An example of a hallmark you might see on a modern day rolled gold piece might read …
https://goldrefiningforum.com/phpBB3/viewtopic.php?t=13849
Sep 28, 2017 · 1. Take 100 grams of 14k gold jewelry 2. Alloy this 100 grams with 500 grams of copper to get just less than 20% pure gold (1/5 is 20% but you have to account for 14k content, which is about 58% gold) 3. SMELT the 14k jewelry with the 500 grams of copper and then drip pour slowly into water to get cornflake type of material 4.
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