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<p>[QUOTE=&quot;leaconcen, post: 1396289, member: 31684&quot;]A few days ago, I received the Pro Par shipment; I order a week ago.&nbsp; The following are my initial conclusions</p><p>1. It will work on copper and bronze without effecting the metal.</p><p>2. It is very oily and takes longer to dry than xylene and it does leave a film.&nbsp; (The film can be rinsed off with isopropyl alcohol.)</p><p>3. In general it seems safer to work with because of less fumes and less toxicity</p><p>4. It will darken any old luster left on silver coins</p><p>5. It is much more expensive than xylenol</p><p>In conclusion my assessment is Pro Par is not worth the expense for people not effected by xylene.</p><p><br /></p><p>In my preparations to use Pro Par, I found a set of 24 4 ounce glass jars with a acetone/ xylene resistant lined lid for about $26 on Amazon.&nbsp; The size is great for soaking coins in acetone or xylene.[/QUOTE]</p><p><br /></p>

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