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<p>[QUOTE=&quot;kanga, post: 1036911, member: 9270&quot;]My first thought would be to question the purity of the acetone used.</p><p>My second thought would be that the acetone reacted with something <b>ON </b>the coin and not the coin directly.</p><p>And of course there is still the possibility that acetone is <b>NOT</b> as non-reactive with the coining metals as I believe.</p><p><br /></p><p>I <u>do</u> know that isopropyl alcohol which is often touted for the same use as acetone <b>VERY</b> often leaves milky spots on coins.</p><p>Again it may be a purity issue.</p><p><br /></p><p>And I believe that water itself is rather non-reactive.</p><p>It either:</p><p>- conveys dissolved material that <b>IS</b> reactive with the coining metal, i.e., the water isn&#039;t distilled.</p><p>- acts as a catalyst for the the coining metal and the environment, particularly environmental gasses.[/QUOTE]</p><p><br /></p>

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