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Testing for gold with acid focuses on the fact that gold is a noble metal which is resistant to change by corrosion, oxidation, or acid. The acid test for gold is to rub the gold-colored item on black stone, which will leave an easily visible mark. The mark is tested by applying nitric acid, which dissolves the mark of any item that is not gold. If the mark remains, it is tested by applying aqua regia (nitric acid and hydrochloric acid). If the mark is removed, then this test dissolves the gold, proving the … WebSep 18, 2024 · Acid tests have a relatively high tolerance. In other words, they are a good rough estimator of gold using the Karat scale, and even then, you shouldn't rely on it to the decimal point. Simply put, acid … WebJSP 10k/14k/18k Gold Test Acid Solutions Tester Kit Detect Metals Scrap Jewelry + Wooden Box + PRO 2x2" Testing Stone. Now $17.99. $19.99. Authenticity Test Kit for Scrap Gold 10K 14K 18K Personal Acid Coin/Jewelry Testing Set. $36.98. GOLD TEST ACID 10K14K18K22K SILVER PLATINUM TESTING KIT STONE WOODEN BOX LOUPE. the office michael scarn movie