Description Gold Silver Platinum testing stone only (please note that you will also need testing acid to conduct tests). Size: 5cm x 5cm x 1.2cm. High quality testing stone essential for testing Gold, Silver and Platinum. It is black in colour for great contrast. A test can be made with one light strike leaving no scratch marks on the item being tested which is a big advantage when testing non scrap items. It is designed specifically for testing, leaving a very visible streak when testing Gold, Silver, and Platinum and it will not damage the pieces you are testing. This brand new stone is a high quality testing stone that can be washed and used again for hundreds of tests. Testing touchstone size 5cm (h) x 5cm (w) x 1.2cm (d). Made in USA. TESTING INSTRUCTIONS. Press firmly and scratch the item to be tested onto the testing stone, then place half a drop of the closest acid to the karat you estimate the metal to be. If the acid dissolves the metal, the metal is less than the carat displayed on the bottle. Try again with a lower level acid. If it dissolves the metal slowly, it is possible that your metal is gold, just not as pure as the karat rating on the bottle. If the metal stays and does not dissolve, it is AT LEAST the karat of the rating on the bottle you used for the test. Happy testing! To order a full kit click on this link gold-testing-kit
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