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<p>[QUOTE=&quot;SuperDave, post: 102301, member: 1892&quot;]Here&#039;s a bit of anecdotal evidence from my collection. Remember, these images are from a cheap microscope, with far less accurate optical resolution than that available from even inexpensive professional-level tools. All images are at 200x, with identical lighting and the best focus I can attain.</p><p><br /></p><p>The surface of a coin I do not believe to have been dipped:</p><p><img src="http://members.arstechnica.com/x/superdave/undipped.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>The surface of the coin I posed earlier in this thread, which retains prooflike mirrors:</p><p><img src="http://members.arstechnica.com/x/superdave/dippedwell.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>The obverse of the same coin, rather overdipped:</p><p><img src="http://members.arstechnica.com/x/superdave/knowndipped.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>The surface of one I dipped the living snot out of:</p><p><img src="http://members.arstechnica.com/x/superdave/extreme.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>For reference, a coin which has been so heavily polished that the cheek is reflective, and no marks show up through my 10x loupe:</p><p><img src="http://members.arstechnica.com/x/superdave/polish.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>Using this very small body of admittedly anecdotal evidence, I conclude that dipping is not going to be difficult to see for any experienced grader. Given a mic of advanced capabilities and known-perfect baseline samples, I would suggest that mrbrklyn might even have underestimated the ease with which dipped coins could be identified.[/QUOTE]</p><p><br /></p>

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