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<p>[QUOTE=&quot;desertgem, post: 1456389, member: 15199&quot;]First, you will not get &quot;moon craters&quot; from acid unless, you are using&nbsp; exremely strong acid and dropping it on drop by drop/ If you put the&nbsp; coin into a diluted acid, it will slowly react with the metal. If it is a&nbsp; magician coin half, then why didn&#039;t they remove the reverse since by&nbsp; this hypothesis they had metal working tools? All of the magician coins&nbsp; I have seen are made that way.</p><p><br /></p><p>To see how acid could dissolve&nbsp; equally, draw a side view with somewhat exaggerated highs and lows, and&nbsp; then draw another image inside that is about 10-20% less, following the&nbsp; contours, the details will stay easily recognizable unless the coin&nbsp; metal is not homogeneous. Remember when we are comparing the thickness&nbsp; of the coin, we are looking a piece of metal that had the acid working&nbsp; on both sides.</p><p><br /></p><p>So I took a sample of nickels and measured their thickness, the average was 1.95mm +/- .04mm. The average thickness of sample of silver Roosies were 1.22 +/- .03mm, so a silver dime is&nbsp; 1.95 -1.22 or .73mm thinner. </p><p><br /></p><p>Using a magnifier, I measured the distance from the rim of a normal nickel from the edge of the coin to almost touching the bottom of the letters on the reverse( to mimic the OP coin), and the distance was about 0.45mm average, so the effects of an acid to reduce the thickness of the nickle from 1.95 to 1.05 ( little less than a dime) would only reduce the diameter of the coin from 21.2 mm to 20.3mm ( 2x.45) which is Not as noticeable as what appears to be the 50% approx. thickness when the reduction in the diameter is only approx. 5%.</p><p><br /></p><p>Also, remember that chemicals such as Nic-A-Date are acid or similar used to <b>bring back details </b>due to changes in the crystal structure of the nickle metal mixture.</p><p><br /></p><p>I see the coin as surely done by an acid unless it is a silver blank, but I think that unlikely. % are very low for that.</p><p><br /></p><p>Anyway, that is my explanation and I am sticking to it, without it in my hands. IMO of course.</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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