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There are several ways to test the hardness of metals, and using some sort of a tester is one of them. It's important to know that this method is not suitable for all types of metalsu2014as a rule, most steel alloys can be tested with mercury; chromium, iron, and nickel can be tested with diamonds; and platinum and copper can be tested by applying pressure to their surfaces. Most other metals (like aluminum or brass) don't need any special tools to determine their hardness.<br>
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