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<p>[QUOTE=&quot;kanga, post: 6553708, member: 9270&quot;]<u>Numismatic Part</u>:</p><p>Slabs on occasion have something on them that it would be nice to remove.</p><p>Generally it&#039;s some adhesive from a label.</p><p>Past experience has shown me that isopropyl alcohol is often good for that job.</p><p>I use the 70% stuff that is also labeled &quot;rubbing alcohol&quot;.</p><p><b>BUT A WARNING</b></p><p>I also know that the 90% stuff will &quot;melt&quot; the plastic.</p><p>And at the moment I have some.</p><p><br /></p><p><u>Non-Numismatic Part</u>:</p><p>So here&#039;s a question for the chemists among you.</p><p>How much distilled water do I have add per unit volume to dilute 90% to 70%?[/QUOTE]</p><p><br /></p>

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