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<p>[QUOTE=&quot;ValpoBeginner, post: 2877385, member: 77066&quot;]ok finally am back...&nbsp; here&#039;s what I had been applying in my grading of coins ... but exciting things are coming out of our NIST labs. </p><p><br /></p><p>Excerpts from the writings of Scott A. Travers, Author of &quot;The Coin Collector&#039;s Survival Manual&quot; </p><p>[ATTACH=full]688879[/ATTACH]</p><p><br /></p><p>I&#039;ve also been taught that to grade proofs you should use a Halogen Bulb.</p><p><br /></p><p>Heres what Travers said about that...</p><p>&quot;(5) Examine every coin under a halogen lamp or a high-</p><p>intensity pinpoint light source.</p><p>When looking beneath the toning of a coin or otherwise</p><p>searching for imperfections, it’s essential that you use the</p><p>right kind of lighting. I first pointed this out in an award-</p><p>winning article published in COINage in 1979. I later</p><p>elaborated on this in my best-selling book The Coin</p><p>Collector’s Survival ManualTM.</p><p>A halogen lamp is especially beneficial when looking at</p><p>proof coins. It will help you spot hairline scratches, which</p><p>can detract considerably from a proof coin’s overall grade. A</p><p>tensor light is adequate for mint-state business-strike</p><p>coins.</p><p>Ordinary light sources such as floodlamps or bare</p><p>filament lights–the kind commonly used in chandeliers–make</p><p>coins appear more attractive than they actually are. For that</p><p>reason, if you’re looking at coins at an auction-lot viewing</p><p>session, you should always make sure there’s a halogen lamp</p><p>or a tensor light source nearby&quot;</p><p><br /></p><p><br /></p><p>But how many of you have heard of the new visual spectral science standard called QCS, overtaking the older consumer preference based CRI standard. The National Institute of Standards and Technology is developing this system using metrics that take into consideration reflectivity and definition over what people just like in their homes.</p><p><br /></p><p>Heres an article on the new standards.</p><p><br /></p><p><a href="https://www.nist.gov/news-events/news/2017/03/standard-lighting-color-preference" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.nist.gov/news-events/news/2017/03/standard-lighting-color-preference" rel="nofollow">https://www.nist.gov/news-events/news/2017/03/standard-lighting-color-preference</a></p><p><br /></p><p>And I am excited about new Neodymium Glass Lamps and RGB lamps that are scoring high on the QCS scale which goes from 0 to 100.</p><p><br /></p><p>Read about that here.</p><p><br /></p><p><a href="https://www.nist.gov/publications/development-color-quality-scale-0" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.nist.gov/publications/development-color-quality-scale-0" rel="nofollow">https://www.nist.gov/publications/development-color-quality-scale-0</a></p><p><br /></p><p>For now Im sticking to my multiaxial halogen and incandescent mix.[/QUOTE]</p><p><br /></p>

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