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https://www.ehow.com/how_6777421_do-purify-using-common-materials_.html
Aug 30, 2017 · Sodium carbonate. Blow torch (oxy-acetylene) Crucible tongs. Bar-type mold. Melting gold at home using everyday materials. You can melt scrap gold at home to purify it using a few specialized tools and some common materials you can purchase at your local hardware store. Pure gold is 24 karats and has a melting point of 1,940 degrees Fahrenheit. If a piece of gold jewelry is labeled as having less than 24 karats (e.g., 14 karats), it means the jewelry …
https://www.jewelry-tutorials.com/gold-refining-purify-process.html
This is a free tutorial on gold recovery method using nitric acid to extract pure gold from old gold and scraps of gold by process of dissolving unwanted metals. When I use this refining method, I regard the purity of the gold …
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