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<p>[QUOTE=&quot;barefoot, post: 912474, member: 25853&quot;]Looked at the link pics! Again, the lines on the pics are still linear, in that they all point the same direction on the coin. Here&#039;s an idea! Take the same coin&nbsp; originally posted on the thread. Scan it several times BUT turn and MOVE the coin on the scanner bed. If the line are on the actual coin, they will still be in the same position no matter what direction the coin is turned on the scanner. If the lines are turned on the coin scans you know it&#039;s the scanner and the laminate to coin reflections! Also I have found that the position on the scanner bed can make a difference! But to me I find it interesting that the stains are not random. (If say I splatter a coin with a reactant, like say ammonia or chlorine, the reaction would show up as a random spatter pattern). The only way it would be linear is if I brushed the agent on. Hope I&#039;m making what I&#039;m thinking understandable? Is there a possibility of removing the coin and cleaning it? It could be that the coin was stored in a holder made of leather and the tanning fluid reacted to the metal? Lots of ideas hitting my head here! Several of the photos show streaking in straight lines on different angles per coin. One at the bottom shows like the coin was held at the edge and dipped? <a href="http://www.cointalk.com/members/rlm-s-cents/albums/10/137/" class="internalLink ProxyLink" data-proxy-href="http://www.cointalk.com/members/rlm-s-cents/albums/10/137/">http://www.cointalk.com/members/rlm-s-cents/albums/10/137/</a>&nbsp;&nbsp; It also could be that the coins are tarnishing evenly except where an agent is protecting the metal somewhat?&nbsp; Just theorizing here! What would cause an alloy to mix in a linear pattern? (versus circular) What they use as an alloy for these coins were 95% copper and the rest was tin and zinc. PURE copper work hardens (starts out soft. then as it&#039;s bent it becomes stiff!) so I am wondering if there&#039;s a test for different oxidation properties for the different metals? Darker streaks copper and the lighter for the tin/zinc?&nbsp; I am looking at my 1936 penny, and with a flashlight at an angle, the raised surfaces (like ole Abe) is tarnished darker than the flats! Dead on though shows just a tarnished copper color, NO streaking![/QUOTE]</p><p><br /></p>

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