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<p>[QUOTE=&quot;-jeffB, post: 2796427, member: 27832&quot;]I&#039;d expect the acid to eat it away at a constant <i>linear</i> rate, more or less, although different work hardening around the edge would probably change the rate there.</p><p><br /></p><p>But if the thickness went from 1.43mm to 1.20mm, decreasing by .13mm, I&#039;d guess the diameter would decrease by <i>approximately the same linear amount</i>, not by the same <i>proportion</i>. That means the diameter would go from 19mm to 18.87mm.</p><p><br /></p><p>So the diameter of the (hypothetically) acid-etched cent isn&#039;t <i>larger</i> than I&#039;d expect. I have no problem believing that the edge would get etched preferentially, meaning the diameter would drop more quickly than the thickness.[/QUOTE]</p><p><br /></p>

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