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<p>[QUOTE=&quot;halfcent1793, post: 2921742, member: 86853&quot;]First off, I concur that the <i><b>proper </b></i>cleaning of coins is not only a good thing to do, but it stabilizes the surface into the future. Coin conservation - keeping them in the best condition we can - is what we should all do.</p><p><br /></p><p>I also concur that dipping is an accepted practice. That doesn&#039;t mean it&#039;s good for your coins. It&#039;s especially harmful to coppers. </p><p><br /></p><p>Also, as others have shown, a dipped copper does not have anything close to natural color, and when you use sulfur to &quot;recolor&quot; it, you create a mineral. Copper reacts with sulfur to form copper(I) sulfide (Cu2S), which is the mineral, chalcocite. It is dark gray to black in color. When you tone your coin with sulfur ointment, your coin’s surface turns to chalcocite. You can’t convert chalcocite back to metallic copper, so recoloring with sulfur ointment irreversibly damages the coin.[/QUOTE]</p><p><br /></p>

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