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https://www.wikihow.com/Test-Platinum
Aug 08, 2019 · Platinum is not magnetic. Therefore, if the piece you are testing is attracted to a magnet, you will know it is not platinum. If you notice a slight magnetic pull, it is more likely that the metal is white gold mixed with nickel. Method 275%(8)
https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Jewelry that contains at least 950 parts per thousand of pure platinum may be marked or described as "Platinum". Jewelry that contains 850, 900 or 950 parts per thousand of pure platinum may be marked "Plat" or "Pt" if a number is used in front of the term to disclose the amount of pure platinum in the mix, such as :
https://www.quora.com/Why-does-my-platinum-ring-become-magnetic
Sep 09, 2019 · Platinum for cast rings is often alloyed with 5% Cobalt. Cobalt is ferromagnetic; meaning that it is attracted to a magnet. The attraction for a 95% Pt and 5% Co ring will be rather weak. You may have to suspend the item from a thread and bring a strong, rare earth magnet near to it …
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