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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://www.ehow.com/how_7879670_test-gold-muriatic-acid.html
Scrape a small amount of gold from the jewelry using the sharp edge of a utility knife or razor blade. Step 2 Allow the scrapings to drop onto the glass saucer. Drop a very small amount of muriatic acid (hydrochloric acid) onto the gold, using a medicine dropper.
https://goldrefiningforum.com/phpBB3/viewtopic.php?t=13849
Sep 28, 2017 · Well, after the HCL wash you neen to disslove your gold into a solution of HCL/clorox or HCL/nitric and then drop your gold out of solution with SMB ( sodium metabisulphite) or copperas. Siphon off your solution and then wash your gold powder in alternate water and HCL washes 2 cycles of 3 times each.
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.
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