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<p>[QUOTE=&quot;rlm&#039;s cents, post: 448176, member: 7957&quot;]My conversations with metallurgist (not about coins) gives me the exact opposite opinion.&nbsp; Trying to smooth surfaces, we could not use chemical reactions because they would deepen the existing defects.&nbsp; Electrolysis works on the high points.&nbsp; My suspicion is that your <font size="6">/\/\/\/\/\</font> would become more like <font size="6">UUUUUU</font>.&nbsp; However, the rougher I was talking about is even smaller than what you are showing.&nbsp; Metals are a lot less uniform than most people think. On the molecular level, there can be significant differences in the reactivity due to the alloy mixing, rolling effects, heat treating and the coin pressing.&nbsp; This is the &quot;roughness&quot; I was referring to.</p><p><br /></p><p>If you know for a fact the dipped coins tone slower, my guess is that the dips contain contain an added chemical that reacts to inhibit future reactions.[/QUOTE]</p><p><br /></p>

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