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<p>[QUOTE=&quot;Conder101, post: 1212486, member: 66&quot;]One of the problems with trying to attempt such a study is that no two coins will have the same surface conditions, the same crud, the same toning etc.&nbsp; This means that what works on one may have disastrous effects on another.&nbsp; And different chemicals will have produced different toning compounds on the coins.&nbsp; If you wanted to run such a test you would have to start with a group of coins or metal samples as close to uniform as possible, strip them down to the bare metal and then treat them identically with various chemicals to try and produce as near as possible identical subjects for your cleaning tests.&nbsp; I have never seen anyone try and do anything close to this.&nbsp; Instead they gather random coins clean them with the various cleaners in a non-systematic way and then try to reach conclusions from the random results.[/QUOTE]</p><p><br /></p>

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