Nitric Acid Test
The least straightforward of these tests, partly because you risk doing permanent damage to your metal in doing so unless, of course, it is pure gold. The premise idea behind this test is that gold is resistant to oxidation and corrosion and so pure gold will not be affected by the acid. Different strengths of acid are available to test different carats, so gold that doesn’t react to the acid is at least as pure as the carat rating suggested, if not higher. Conversely, if you apply acid marked for 22 carat gold to your 24 carat bar, you know that your gold is at best 22 carat gold, and maybe not gold at all.
Dragging your gold over a ceramic plate is another quick and uncomplicated way to test your gold. Simply draw your gold across an unglazed ceramic plate, applying slight pressure. If you can see a gold mark on the ceramic once you’ve done this, then the gold is real. However if the mark is black then it is fake.