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<p>[QUOTE=&quot;kanga, post: 3629923, member: 9270&quot;]Yep, that&#039;s essentially what I&#039;m saying.</p><p>Any process that doesn&#039;t interact with the coining metal is conserving.</p><p><br /></p><p>For instance a silver dip removes the tarnish from a silver coin.</p><p>Tarnish is often the result of sulfur reacting with the silver resulting in silver sulfide.</p><p>When you remove the silver sulfide with a silver dip both the sulfur <b>AND </b>the silver are removed.</p><p>The coin has therefore been <u>cleaned</u>.</p><p>It&#039;s surface has been permanently and irreversibly changed.</p><p>That&#039;s why the surface loses its luster.</p><p><br /></p><p>The liquids that you mentioned will not do that UNLESS you also use physical (rubbing) action.</p><p>The metal &quot;flow&quot; lines caused when a coin is struck give a coin its luster.</p><p>They are fragile and easily removed.</p><p>That results in a coin with a dull appearance.[/QUOTE]</p><p><br /></p>

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