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<p>[QUOTE=&quot;Insider, post: 2544172, member: 24314&quot;]Metal objects have internal structure (I&#039;m sounding like a certain member here <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie103" alt=":yack:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie103" alt=":yack:" unselectable="on" unselectable="on" />).&nbsp; Oh, and this is just my opinion. </p><p><br /></p><p>Metal objects (most?)have internal structure.&nbsp; Before becoming a coin the alloy is mixed, cooled, rolled, drawn. punched, annealed, and upset.&nbsp; Then it is struck into a coin.&nbsp; I believe all the processes above tend to align the internal atoms of the coin. </p><p><br /></p><p>One thing for sure, I do know what strong acid does to a coins surface as I have destroyed a few as a youth.&nbsp; The surface is changed - often with a colored (yellow in this case) build up we see on the edge.&nbsp; Note: I was not 100% sure what happened to the coin (except for the &quot;flow&quot;) UNTIL the OP posted a photo of the edge.&nbsp; </p><p><br /></p><p>Anyway, the deep ridges you ask about are not normal.&nbsp; The surface around and on the feathers and edge is a solid characteristic of chemical alteration. So, my guess is that the chemical was first on the center (longer and more concentrated) and then ran outward allowing for deeper penetration that formed the deeper etch. </p><p><br /></p><p>Ans as I said, I believe the &quot;straight lines&quot; on the coin were atomically in the metal.&nbsp; Note that ALL the etching is vertical.&nbsp; Now we can all wait for a metallurgist to post something.</p><p><br /></p><p>There is a well-respected Indian cent <span style="color: #b300b3">numismatist</span> (not Rick Snow) whose name escapes me (old age) who is a metallurgist who would probably answer your question better or more accurately.</p><p><br /></p><p><span style="color: #b300b3">EDIT: Chris Pillod&nbsp; </span><span style="color: #000000">There may be hope for my brain after all.</span>[/QUOTE]</p><p><br /></p>

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