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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://oureverydaylife.com/how-to-remove-gold-plating-12223290.html
Grip the the piece of jewelry with the pliers. Dip the jewelry in the boric acid/alcohol solution while the stirred solution is in motion. Remove the jewelry from the solution and move away from the jar or basin. Heat the jewelry with the torch. The alcohol will burn off, leaving a white powder of boric acid.
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://sciencing.com/extract-gold-scrap-5718325.html
Observe the muddy separation that collects at the bottom of the acid container. This substance is pure gold. Extract the gold from the container by pouring off the acid using a filter, then rinsing and re-filtering the substance three times with distilled water. The result will be nearly 100 percent gold.
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