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<p>[QUOTE=&quot;physics-fan3.14, post: 26480538, member: 19165&quot;]Can I explain my perspective? and if we still disagree we can go our separate ways. </p><p><br /></p><p>In my mind, anything that physically changes the metal of the coin is cleaning. This is different than conservation, which is removing foreign debris that isn&#039;t supposed to be there in the first place. Thus, a soak in acetone to remove PVC is conservation, not cleaning. </p><p><br /></p><p>However, a dip is removing actual silver atoms that have chemically reacted with sulfur in the air. When you dip, no matter how slight or how it looks afterwards, you have changed the surface of the metal. </p><p><br /></p><p>Now, done properly this widely considered acceptable. I personally prefer to avoid coins which were obviously dipped even if they retain their luster, but that is my own personal preference. </p><p><br /></p><p>Anyways, that is why I consider dipping to be cleaning. Your opinions may vary.[/QUOTE]</p><p><br /></p>

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