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https://globalbullionsuppliers.com/blogs/blog/how-accurate-is-acid-testing-for-gold
More often than not, an acid test using 14K acid can tell the even lightly trained eye 10K gold. Likewise, a 22K acid will very clearly show you that something is not 18K whereas 18K acid is less reliable.
https://www.gia.edu/bench-tip-use-the-touchstone-method-for-testing-purity-karat-gold
Jul 27, 2021 · Measured strengths of nitric acid are used to test for 14k and lower. Aqua regia, a mixture of one part nitric acid and three parts hydrochloric acid, is used to test higher karat purity through the process of comparison and elimination.
https://www.starcojewellers.com.au/a-jewelry/acids-are-used-to-test-the-quality-of-gold-jewelry.html
Gold Testing Acid Kit – which may include either hydrochloric and nitric acids along with a dropper, or particular samples for each type of gold Karat acids (10K acid, 18K acid, 22K acid, etc.) Black Gold Testing Stone – you must thoroughly rub it with a 320 grit sandpaper, wash and rinse it before making each test.
https://www.chegg.com/homework-help/questions-and-answers/sct-sare-use-prepare-laboratory-question-2-acids-used-test-quality-gold-jewelry-piece-jewe-q34217579
Question: Sct Is Sare To Use Prepare Yourself For The Laboratory: Question #2 Acids Are Used To Test The Quality Of "gold" Jewelry. Both The Piece Of Jewelry To Be Tested And A Sample Of Gold Of Known Purity Are Rubbed On A Flat Piece Of Stone To Transfer Some Of The Metal Onto The Stone.
https://globalbullionsuppliers.com/blogs/blog/how-accurate-is-acid-testing-for-gold
More often than not, an acid test using 14K acid can tell the even lightly trained eye 10K gold. Likewise, a 22K acid will very clearly show you that something is not 18K whereas 18K acid is less reliable.
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