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<p>[QUOTE=&quot;GDJMSP, post: 239985, member: 112&quot;]I would say acid as well. Something to remember, most people think of a coin&#039;s design as being only on the surface. Therefore if a coin were dipped in acid that the design, being on the surface ,would be the first thing eaten away. This is not true.</p><p><br /></p><p>Think about what Nic-a-Date does - it restores a worn away date to the point where it is visible again. And what is Nic-a-Date and how and why does it work ? It&#039;s an acid and it works because it eats away the softer metal in the fields of a coin which allows the date to be visible once again. And the date is visible once again because the struck up portions of the design cause the metal to be harder and more dense in those areas.</p><p><br /></p><p>Same thing applies to a coin dipped in acid. Even thought the majority of the coin is literally eaten away to the point where the coin is but a fraction of it&#039;s original thickness and the diameter is less than it should be - the design on both sides are still yet visible. That&#039;s because when a coin is struck the design is not just on the surface, it goes all the way through the coin.[/QUOTE]</p><p><br /></p>

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