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<p>[QUOTE=&quot;desertgem, post: 2064760, member: 15199&quot;]&quot;Regular&quot;, no, actually very seldom, only when needed. I use acetone on any metal coin with no concern of problems. I have used E-z-Est dip and the old name Jeweluster on silver for over 30 years, and after my first trial, started using the diluted method, throwing the diluted leftover away each time and acetone as mentioned above. The only other chemical mixture I use, besides acetone, is on copper coins and are the products from member BadThad who is an industrial chemist~ Verdigone, etc. I have experimented with these and know how they will react. Coins from these procedures have easily passed PCGS and NGC ( as well as ICG long ago) with no rejections or details. Just be careful and do one at a time, and don&#039;t rush. There are plenty of 90% silver and 5 cent value lincolns to use for experience. YMMV.[/QUOTE]</p><p><br /></p>

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