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<p>[QUOTE=&quot;Insider, post: 2930487, member: 24314&quot;]Before disagreeing with much of this, I&#039;ll just write that I have some experience with coins such as this. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie26" alt=":bookworm:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie33" alt=":cigar:" unselectable="on" unselectable="on" /></p><p><br /></p><p>physics-fan3.14, posted:&nbsp; &quot;I wouldn&#039;t consider this an error worth designating. In extreme cases, however, they will annotate it on the slab. Unfortunately, this type of streaking lowers the value, not enhances it.&nbsp; I would, however, caution against trying too hard to remove the streaks. You could get a details grade for &quot;streak removed.&quot;</p><p><br /></p><p>This type of problem does lower a coin&#039;s value significantly.&nbsp; However, it is a minting error as it happened at the mint due to an imperfect planchet.&nbsp; In many cases, it appears as just a discoloration of copper metal (improper mix)&nbsp; on the surface. If coin dip is applied, the streak turns back to &quot;pink&quot; copper color.&nbsp; In other cases, the black is some form of debris that has become lodged into the coin.&nbsp; It was either in the planchet or fell on to it before the coin was struck. </p><p><br /></p><p>As I posted, acid will remove debris or turn the copper pink.&nbsp; The ONLY time you will get a spot removal is when some idiot tries to scratch the debris off.&nbsp; If it is dipped and the streak turns pink you may get a &quot;cleaned&quot; designation.&nbsp; Over time, any copper will become dark again.</p><p><br /></p><p>Blissskr, posted: &quot;I&#039;d leave it alone, on coins like this where the strips get chemically removed &#039;no idea what&#039;s used but I&#039;m assuming dip of some sort&#039; there is usually a very noticeable color difference in the area where the strip used to be.&quot; </p><p><br /></p><p>Not entirely true.&nbsp; If it is debris, the surface will look like a planchet flaw or a place where a strike-thru fell out.&nbsp; If copper streak, the color will change as this poster wrote.</p><p><br /></p><p>TheFinn, posted: &quot;It&#039;s not slag - the metals have been purified several times.&nbsp; It is copper.&nbsp; It turns to copper oxide, which is black.&quot;&nbsp; </p><p><br /></p><p>While this is true, without seeing the coin, most of the time it is a copper impurity yet many times it is a substance that does not belong on the coin that can be removed chemically.[/QUOTE]</p><p><br /></p>

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