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https://www.leaf.tv/articles/how-to-test-jewelry-gold-platinum-palladium/
To test for platinum, use a magnet. This is the simplest way to test platinum jewelry without causative acids. If the magnet sticks, there is iron in the piece, and the piece is not pure.
https://blog.esslinger.com/how-to-test-for-platinum/
Jun 12, 2014 · Apply a drop of your platinum testing acid across the streak on your testing stone. Note: If you will not be testing platinum often, you can use 22 karat gold acid to test for platinum. However, if you plan to be testing platinum with any sort of regularity, you will want to invest in a platinum testing …
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