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<p>[QUOTE=&quot;JMGallego, post: 2666368, member: 35622&quot;]Agree, but as explained in some of the articles, the bond is covalent because of the lone pair of the nitrogen.&nbsp; I will look at my references and double check it.&nbsp; Thus, too, it should be easy to remove, but I have not found an article describing how to remove it, except for abrasive method, agh! not good for coins. I tried several common organic solvents and I can still see the hydrophobic effect of BTA.&nbsp; I recently purchase DMSO to see if it is strong enough to remove it, but I have not had a chance to test it.[/QUOTE]</p><p><br /></p>

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