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<p>[QUOTE=&quot;desertgem, post: 1911841, member: 15199&quot;]Before using a compound on any surface, one should research its composition. </p><p>Brasso:&nbsp;&nbsp; <a href="http://lakefrontsupply.com/MSDS/Brasso/Brasso_%20Polish_%20MSDS.pdf" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://lakefrontsupply.com/MSDS/Brasso/Brasso_%20Polish_%20MSDS.pdf" rel="nofollow">http://lakefrontsupply.com/MSDS/Brasso/Brasso_ Polish_ MSDS.pdf</a></p><p><br /></p><p>is mostly Stoddard&#039;s solvent (&nbsp; mineral spirits) , petroleum products&nbsp; ( these won&#039;t directly&nbsp; harm the metal and are similar to organic solvents mentioned before on CT )</p><p><br /></p><p>but also about 10% crystalline silica ( SAND), and kaolin ( clay like material, but still abrasive )&nbsp; These are needed to make the metal shine brightly on spoor, buckles, etc....but when coins are look at with a magnifier and experience, it will be readily visible. </p><p><br /></p><p>Re-toning of any coin is not just reactions with sulfur ( Deller&#039;s or H2S as per White&#039;s method from Sodium sulfide, or raw sulfur flowers ( flour)), but other compounds that are in the environment and also add to the tone color. The toning of a coin originally reflects the environment that most layers were produced. Polluted areas product quick toning and &#039;Clear sky &#039; areas less. Add in industry, weather, etc. and you get the various coining effects.[/QUOTE]</p><p><br /></p>

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