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<p>[QUOTE=&quot;desertgem, post: 886983, member: 15199&quot;]Thanks for the answer. Somewhat I expected. Tarn-x is thiourea and sulfamic acid ( same materials as found in silver coin dip) and a proprietary&nbsp; &quot;polishing&quot; material. It is designed to remove the tarnish and the polish will attach to the surface of the &quot; say silver spoon&quot; and is generally a abrasive was to be rubbed off with a cloth, leaving a shining silver surface. I suspect some of the white material could be polish remnants, maybe even in some of the surface pits and would not rinse out with water.</p><p><br /></p><p>I would try pure acetone to see if it might dissolve any polish material. Shouldn&#039;t hurt the coin. Use glass containers, preferably outside away from flames, and repeat with a new solution each time. In California, used acetone can be allowed to evaporate.[/QUOTE]</p><p><br /></p>

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