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<p>[QUOTE=&quot;hontonai, post: 560942, member: 4703&quot;]Chemical reaction between the metal and the atmosphere.&quot;Toning&quot; is simply a euphemism for &quot;tarnishing&quot; which the user of the word doesn&#039;t find offensive.&nbsp; I never use that term myself.Sure, if severely damaging the value of the coin doesn&#039;t bother you, just <ul> <li>(Good) Boil it in an aluminum pan with baking soda dissolved in the water, or</li> <li>(Also good) Boil it in a steel or enameled pan lined with aluminum foil, or</li> <li>(Better) Use a high quality silver polish and rub the bejeebers out of it, or</li> <li>(Best) Go over the surface using a high speed drill motor equipped with a wire brush (aka &quot;whiz&quot; it).</li> </ul><p>[/QUOTE]</p><p><br /></p>

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