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<p>[QUOTE=&quot;calcol, post: 3228460, member: 77639&quot;]A short exposure (less than an hour) of more reactive metals like copper, zinc and aluminum to high-grade acetone is unlikely to hurt them.&nbsp; I recommend only reagent grade acetone be used. Impurities will be in higher concentration in lower grades of acetone.&nbsp; Concern with longer exposure is that some of the impurities sometimes found in acetone are phenol, formaldehyde, acetaldehyde, and acetic acid. These will attack reactive metals. </p><p><br /></p><p>I recommend that coins that have had an acetone bath be rinsed with fresh acetone and allowed to air-dry rather than be rinsed with water, which may leave a coating or spots.&nbsp; Remember acetone and its vapor are extremely flammable.&nbsp; Do not reuse acetone.</p><p><br /></p><p>Be aware that even a short exposure of copper coins to acetone can noticeably alter their appearance.&nbsp; This is because brown color that is assumed to be toning may be due in part to dark colored dirt, oil, wax, varnish, etc.&nbsp; These substances will be removed, and the coin color will be different after its acetone bath.&nbsp; The new color may or may not be an improvement.</p><p><br /></p><p>If something is attached or applied to a coin (hologram, gem, artificial color, etc.), acetone may remove it.</p><p><br /></p><p>Cal[/QUOTE]</p><p><br /></p>

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