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<p>[QUOTE=&quot;desertgem, post: 3506073, member: 15199&quot;]If the coin is fairly clean from adhering substances and the acid is strong, the size and weight will change in a fairly even manner. The longer it goes, the more &quot;weaker details&quot; occur and eventually may become distorted. The altered ones I have seen and also made myself to confirm&nbsp; how such is done, usually only go just enough for a visible/measurable difference in weight&nbsp; and diameter beyond normal tolerances so they can be sold to unknowing others as an error coin. I use a metal stamp with a diamond gemstone pattern on the surface to mark mine so they are identifiable after I lose my mind <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />.&nbsp;&nbsp; Jim[/QUOTE]</p><p><br /></p>

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