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<p>[QUOTE=&quot;calcol, post: 3174057, member: 77639&quot;]Good advice, Jim.&nbsp; However, a rinse with purified water after the initial acetone bath can have the benefit of removing potentially corrosive&nbsp; inorganic salts which aren&#039;t soluble in acetone.&nbsp; These can get on a coin from a number of biological (sweat, spit, etc) and non-biological sources.&nbsp; Then there can be a final rinse with acetone to remove the water.</p><p><br /></p><p>The above scheme targets both polar and non-polar contaminants.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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