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<p>[QUOTE=&quot;geekpryde, post: 1685750, member: 36248&quot;]Ah, you do realize that human tooth enamel is the hardest substance in the body?&nbsp; Furthermore, it has a hardness<u> greater than </u>all of the following:&nbsp; gold, silver, aluminum, zinc, copper, iron, nickel, platinum, and steel.</p><p><br /></p><p>So I am not really sure if your comment is trying to be funny, or you just are really confused on what hardness means (scratch resistance) and why it would be bad to use a tooth brush on a coin you don&#039;t want to scratch.</p><p><br /></p><p>Now, when they start making coins out of Tungsten carbide, maybe we wont have to worry about tooth brushes.&nbsp;&nbsp; If you want to do some additional reading, google Mohs scale.[/QUOTE]</p><p><br /></p>

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