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https://blog.esslinger.com/basic-gold-needle-scratch-test/
Jun 12, 2014 · Place a drop or two of the matching acid to the gold testing needle you used on top of the two scratch marks. As soon as the acid hits the testing stone and the marks, watch and compare the speed at which the scratches dissolve.
https://www.ishor.com/scratch-test-instr
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https://www.youtube.com/watch?v=VPSi2kulJ94
May 03, 2019 · Scratch Testing- How to test the purity of gold, silver and platinum, using the scratch testing method. The scratch test is sensitive to within less than 1...
https://www.sbcgold.com/blog/test-gold-5-simple-ways-spot-fake-gold/
Jul 24, 2014 · Genuine gold will stand up to your attempt to conduct a nitric acid test at home. Make a tiny mark on the piece of gold to penetrate the surface. Drop a small amount of liquid nitric acid on that scratch and wait for a chemical reaction. Fake gold will immediately turn green where the acid is.
https://www.jewelrynotes.com/how-to-test-if-gold-is-real/
If a jewelry piece is gold plated or gold filled, a deep enough scratch would reveal the metal beneath the gold surface. So, if you see any scratches under which the metal below is visible or discolored spots where the top layer has been rubbed off, this is a sign that the jewelry is just covered with gold and note made entirely of it.
https://www.wikihow.com/Test-Gold-with-Vinegar
Sep 09, 2019 · Fill an eyedropper with white vinegar. White vinegar is the most acidic vinegar, so it works the best for testing gold. It is also clear-colored, so it will show a color change the best. You’ll want to use an eyedropper to pour your vinegar so that you can control the amount that you put on your gold …Views: 36K
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