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<p>[QUOTE=&quot;GDJMSP, post: 3250874, member: 112&quot;]Put simply, it chemically tones the coins darker.</p><p><br /></p><p>There&#039;s a half dozen, maybe more, products like this that sold under various names. Deller&#039;s Darkener is one, and there are quite a few with Nic A something or another in the name. And these are not to be confused with Nic A Date which is an acid based product that helps reveal the dates on coins where the date has been worn away.</p><p><br /></p><p>All of the darkener products are typically used to mislead people. They can be used to help hide or even cover up hairlines, contact marks, light scratches, harsh cleaning, things like that. Or they can be used to make coins that have been over-dipped look like they have not been over-dipped. Or, to make even coins that have been properly dipped to be more acceptable looking to people who prefer their coins toned somewhat.</p><p><br /></p><p>Recognizing coins that have been treated with these darkening chemicals can often be difficult, sometimes they can even fool the TPGs and hide things that would otherwise result in the coin being put in a problem slab. The effectiveness of these chemicals is determined by the skill level of the person using them.</p><p><br /></p><p>If the person has little skill, those with the necessary experience can see it right away. If you don&#039;t have the experience you probably won&#039;t notice it at all, even when the user was a novice.</p><p><br /></p><p>It&#039;s just another one of those things that knowledgeable people have to know.[/QUOTE]</p><p><br /></p>

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