Gold isn’t the only metal you might find yourself in a position to buy. You
may find yourself confronted with people wanting to sell platinum. Use this
guide to learn the ins and outs of testing platinum. When you are testing for
platinum, you will approach the process in much the same way you would with
testing gold: you’ll use the testing stone again and use acid to determine the
metal content of the piece you are testing.
One thing to pay attention to and be aware of before testing for platinum is
that iron and steel items will pass the streak test for platinum so before
attempting a streak test, you should always start by testing any suspected
platinum with a powerful magnet.
If the metal is attracted to the magnet, you are not dealing with platinum.
Once you have ruled out steel and iron, take the item and scratch it along
the surface of the stone like you would with any piece of gold. Make sure that
you have a thick and visible deposit line that you can test accurately and is
about 1 inch long.
Apply a drop of your platinum testing acid across the streak on your testing
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 acid.
Identify the reaction. If the metal you are testing is platinum, the streak
should keep its bright white coloring for over a minute of exposure to the
Be aware that other than iron and steel, there are plenty of other white
non-magnetic metals that will give false platinum reading like chromium cobalt,
dental materials, some class rings and some metals frequently used in stainless
flatware. Always try to verify your results in more than one way whenever