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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 as 22kt, and I alloy it accordingly down to 18kt or 14kt.
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.
https://www.wikihow.com/Test-Gold-with-Vinegar
Aug 26, 2019 · Use an eyedropper to put 2 or 3 drops of vinegar on your gold. You can set your gold piece in a bowl or on a plate to collect any vinegar that runs off of it. You only need to put a couple of drops of vinegar on your gold, or enough where the vinegar can stay in …95%(20)
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 …
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