some sophisticated fakes use non-magnetic metals, so passing this test does not automatically guarantee that the part is authentic.
The Vinegar Test
White vinegar is another useful homemade reagent. A drop is placed on the surface of the piece and wait a few minutes. If the color changes or there is a visible reaction, it is a sign that the part contains other metals. Pure gold should not show any alteration on contact with vinegar.
The density test
Gold is one of the densest metals in existence. You can weigh your piece on a precise scale and then dip it
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