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<p>[QUOTE=&quot;Insider, post: 2487285, member: 24314&quot;]Whatever...as long as the OP understood the message. </p><p><br /></p><p>Nevertheless, let&#039;s be more specific and consider things as others who are not on CT might believe. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie14" alt=":angelic:" unselectable="on" unselectable="on" />&nbsp; [USER=22331]@imrich[/USER] How am I doing?</p><p><br /></p><p>1. TPGS professionals principally use &quot;skin&quot; to refer to the color tones seen on gold. Over time, some of this jargon has been applied to residues on silver but <span style="color: #b30000">not</span> to the toning on silver.</p><p><br /></p><p>2. &quot;Surface texture&quot; has <span style="color: #b30000">NOTHING</span> to do with &quot;skin.&quot; &quot;toning,&quot; or &quot;surface residue;&quot; unless some one <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie30" alt=":bucktooth:" unselectable="on" unselectable="on" /> wishes to nitpick and describe the &quot;texture&quot; of a <span style="color: #b30000">thick </span>residue like corrosion.</p><p><br /></p><p>3. Actually, I have found by experience that in very many cases, acetone will lighten toning and even the &quot;skin&quot; on gold!</p><p><br /></p><p>4. &quot;Surface contamination&quot; covers a very broad range.&nbsp; So broad and complicated that others can discuss it if they wish.&nbsp; All I will say here is this:&nbsp; Soon after a coin is struck its surface starts to become contaminated. In many cases this can be a good thing.&nbsp; In others not so good.&nbsp; Anything we do chemically (acetone, water, etc) will change the surface for <span style="color: #b30000">better </span>or for <span style="color: #b30000">worse</span>. </p><p><br /></p><p>Thanks for your comments for all here to clarify what I posted and thanks for reading this too. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie14" alt=":angelic:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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