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<p>[QUOTE=&quot;-jeffB, post: 7602018, member: 27832&quot;]Most paper manufacturing processes use sulfur compounds. In general, coarser and darker papers seem to bear <i>more</i> sulfur. Sulfur is the main culprit in tarnishing (toning) coins.</p><p><br /></p><p>Kraft paper seems like a terrible choice for shipping coins, unless you&#039;re <i>trying</i> to abrade and tarnish them.</p><p><br /></p><p>As for &quot;paper is softer than metal&quot;:</p><p><br /></p><p>1) Paper is not pure cellulose. It usually contains mineral binders or fillers, and can have dust and grit on its surface (as can the coin itself).</p><p><br /></p><p>2) It&#039;s <i>not</i> the case that &quot;softer things can&#039;t scratch harder things&quot;. I got to try out an experimental <i>diamond</i>-coated frying pan, supposed to be &quot;non-stick and the last word in scratch resistance&quot;. I scratched it up very nicely with a table knife.</p><p><br /></p><p>3) Arguments from first principles are compelling, but they don&#039;t trump real-life experience. Grab a shiny metal object and a sheet of paper, rub on the metal for a while with the paper, and <i>see for yourself</i>.[/QUOTE]</p><p><br /></p>

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