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https://portlandgoldbuyers.com/gold-testing-nitric-acid/
How to Apply Nitric Acid for Testing Gold – Test the Core Most gold jewelry has a Karat mark stamp (10K, 14K, 18K, 585, 750, etc) However “stamping is for free”. If the gold item is not stamped, and it looks like it is gold, it is a good idea to test the “core” of the item, not just the surface.
https://www.youtube.com/watch?v=7PU_KHq7XRw
Jan 24, 2018 · This video will show you how we test 10K gold. We use Acid, a Test Stone and a control Test Needle for testing.Author: Beach Gold
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