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<p>[QUOTE=&quot;physics-fan3.14, post: 3253499, member: 19165&quot;]Haha, 30-40 inch mirrors is simply hyperbole. That is ridiculous. </p><p><br /></p><p>However, yes, the basic idea of Prooflike versus Deep Prooflike is how &quot;deep&quot; the mirrors are. A &quot;shallow&quot; mirror will show clear reflectivity from a couple of inches away, a deeper mirror will show clear reflectivity from farther away. </p><p><br /></p><p>There is no real clear, defined standard for how many &quot;inches of reflectivity&quot; are required for each designation, but you&#039;ll often hear people talk about 2-3 inches for PL, 5-6 or more for DPL. There is also some variation based on date - some dates are known for their highly reflective surfaces, and so might be judged a little more strictly. </p><p><br /></p><p>A good way to measure this at home is by using a ruler held perpendicular to the surface of the coin. Look at how far away you can clearly read the increments, and that&#039;s your measure of reflectivity. You can do the same thing with a newspaper, or any reasonably sized printed text. How far away can you read it? That&#039;s how deep the mirrors are. </p><p><br /></p><p>In the grading room, the graders do not use these sorts of methods. They have seen hundreds and thousands of PL and DPL coins. They will often use their thumb or a finger, holding it over a coin and see how sharp the reflection is. They are usually pretty good at judging PL/DPL based on this. This is easier to do with raw coins than slabbed ones, of course. </p><p><br /></p><p>As for the coin in your link - that is definitely PL, and definitely not DPL. The seller is just making up stuff to add hype, and hopefully lure someone in.[/QUOTE]</p><p><br /></p>

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