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<p>[QUOTE=&quot;davidh, post: 484319, member: 15062&quot;]If you use a 200x microscope to look at the surface of a newly minted coin you&#039;ll see what look like mountains and valleys.&nbsp; It&#039;s these features that produce what is called Luster.&nbsp; Dipping such a coin will remove the peaks from those mountains and leave you with hills and valleys.&nbsp; You may still have some luster but it won&#039;t be as pronounced.&nbsp; Remember, a dip is acid and will eat the metal away.&nbsp; The amount of metal removed is dependent on the time in contact with the dip.</p><p><br /></p><p>That said, if I have a lower grade coin with heavy toning, I wouldn&#039;t hesitate to dip it to remove the tone.&nbsp; By lower grade, I mean F, VF or EF.&nbsp; The coin&#039;s already worn so what harm is the cleaning going to do?&nbsp; Anything less than a F grade I wouldn&#039;t bother with anyway.[/QUOTE]</p><p><br /></p>

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