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<p>[QUOTE=&quot;Insider, post: 2511102, member: 24314&quot;]Corrosion eats into the metal leaving pits.&nbsp; By products of corrosion can be raised around or on top of the reaction site.&nbsp; It is all corrosion to me and can be red, black, green, brown or gray (horn silver), depending on the metal being corroded. </p><p><br /></p><p><br /></p><p><br /></p><p>No one I know ever did; however, I suppose a nice even coating of HS will be more appealing than a splotchy one.&nbsp; </p><p><br /></p><p>While removing it, if it flakes off, the surface underneath will be dull.&nbsp; If you are not careful, the slightest contact on this micro-powdered surface will leave a fresh scratch as new silver is exposed.&nbsp; Mechanical abrasion will remove all but the most solidly attached debris and leave you with a harshly cleaned coin.</p><p><br /></p><p>It is best to leave these coins alone.&nbsp; Even professional conservation using electrolysis cannot restore a damaged surface.[/QUOTE]</p><p><br /></p>

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