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https://www.esslinger.com/test-acid-12-grams-for-gold-silver-and-platinum/
To Test For 18k. Scratch the test piece on the stone and apply 18k acid. Any gold that is less that 18k will disappear in less than 30 seconds. Gold that remains on the stone is 18k or higher. To Test For Platinum. Scratch the test item on the stone and apply platinum acid. If the material is platinum, it should keep its white, bright color.
https://www.youtube.com/watch?v=INrJuXPzaH4
Apr 21, 2017 · Wondering how to test if jewelry is actually gold or not?Steve from The Bullion Brothers LLC (www.thebullionbrothers.com) shows how to use acids to test if y...Author: Arcadia Economics
https://www.youtube.com/watch?v=U6bjePFhS8I
Dec 31, 2013 · Demonstrating today the testing of 14K gold with acid. Some jewelry can be gold plated and so you may have to scratch it really good to insure it's real gol...
https://www.etsy.com/market/jewelry_testing_kit
Gold silver platinum test stone acid testing jewellery jewellers 9CT 18K rings Redroosteruk 4.5 out of 5 stars (1,956) $ 5.17. Add to Favorites Economy Gold Testing Stone for Jewelry Acid Scratch Test 10k 14k 18k 21k 22k FindingsOutletInc 4.5 out of 5 stars ...
https://globalbullionsuppliers.com/blogs/blog/how-accurate-is-acid-testing-for-gold
It is essential to note that acid testing can damage the jewellery as you need to physically scratch it before applying the acid. The acid is also very corrosive and dangerous. You should wear gloves and apply care when performing the test. It can also be destructive to the metal if that metal is significantly lower than the acid's strength.
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