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<p>[QUOTE=&quot;borgovan, post: 519317, member: 13016&quot;]Polishing generally refers to a mechanical process. It is sometimes used interchangeably with words like buffing. </p><p>&nbsp;</p><p>Dipping is placing a coin into a caustic solution. The top few layers of molecules (metallic oxides, or toning) are removed, but so are a few layers of the metal of the coin. This is why coins get shiny when dipped, but also they get a &quot;flat&quot; appearance due to a loss of luster. The waves in the top layers of the coin that created the luster have just been washed away.[/QUOTE]</p><p><br /></p>

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