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<p>[QUOTE=&quot;-jeffB, post: 2020014, member: 27832&quot;]How much chemistry do you want? <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>I think E-Z-Est, one of the most commonly-used dips, is a dilute solution of sulfuric acid and thiourea. It works by &quot;reducing&quot; silver sulfide, the main component of tarnish, back to silver and hydrogen sulfide. Unfortunately, it can&#039;t return that silver to the coin in its original state, and (apparently) it can slowly attack the actual silver surface of the coin if you leave it long enough.</p><p><br /></p><p><a href="https://www.cointalk.com/threads/my-understanding-flawed-of-cleaning-a-coin-by-dipping.201576/" class="internalLink ProxyLink" data-proxy-href="https://www.cointalk.com/threads/my-understanding-flawed-of-cleaning-a-coin-by-dipping.201576/">Here&#039;s a thread with more discussion</a>.[/QUOTE]</p><p><br /></p>

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