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<p>[QUOTE=&quot;stldanceartist, post: 1213800, member: 13307&quot;]It&#039;s interesting, because their label is contradictory - &quot;does not change the color&quot; and &quot;do a few test coins to become familiar with how product works.&quot;&nbsp; Of course, this could be a legal liability statement - as Conder stated, no two coins are exactly alike and I am getting the feeling (just a feeling) that you will never really be able to predict what a certain product will do to a certain coin.&nbsp; How many &quot;test&quot; coins does Betterbilt expect you do experiment on to become familiar with the products&#039; interaction with coins?&nbsp; Ten?&nbsp; 100?&nbsp; 1,000?&nbsp; I feel like you could alter the entire population of copper coins before you could accurately predict what would happen 90% of the time.&nbsp; Again, this is why I feel there should be a reasonable case study on the subject.&nbsp; In fact, once I get back to school in August (and have my photo setup available) I may just perform this on some Memorials - a product I can easily obtain, has little risk in regards to value, and have extremely high mintages (so no worry about attrition.)&nbsp; If I had millions of dollars I might commission a professional study...but looks like I&#039;ll just have to settle for a second-rate, do-it-yourself scientific study...lol...of course, great things have come from people who put time into questions they had![/QUOTE]</p><p><br /></p>

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