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<p>[QUOTE=&quot;GDJMSP, post: 392430, member: 112&quot;]Of course luster can be gone. Luster is an effect, not a tangible thing you can touch or feel. It is merely the reflection of light. Luster is caused by the almost microscopic flow lines in the metal due to the coin being struck. Those lines are very, very fragile and can be worn away by even the slightest wear. Commercial coin dips can completely destroy luster in just a few seconds. On silver, copper and nickel toning can destroy luster if the toning is allowed to proceed to its ultimate conclusion - corrosion. </p><p><br /></p><p>On gold, the toning affects luster to a lesser degree, but it still has an effect. And anyone who tells you that gold coins don&#039;t tone - well they haven&#039;t looked at very many gold coins because it absolutely tones. But since gold is soft, the luster on a gold coin is even more susceptible to wear or even slight contact. It can be brushed away easier than on silver, copper or nickel. Even that MS70 can be detrimental to luster on gold if left too long.</p><p><br /></p><p>As to your question - &quot;So according to you these &quot;detergents&quot; only remove particles exposing what already exits?&quot; - yes.[/QUOTE]</p><p><br /></p>

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