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<p>[QUOTE=&quot;Conder101, post: 1338006, member: 66&quot;]If you do it be sure to strip all the coins with a commercial dip first and a good rinse with distilled water.&nbsp; You have to make sure that all the coins start out with the same type surface qualities or it isn&#039;t a valid test.&nbsp; Two coins just taken straight out of the same roll and put into two of the same envelope and kept together could develop very different toning depending on the thickness and distribution of oils on the coins just coming from the mint.&nbsp; And if two coins done like that gave different results how could you ever say anything about different types of envelopes?&nbsp; The stripping of the coins removes some of the unknown variables from the test and hopefully makes it more reproducible.[/QUOTE]</p><p><br /></p>

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