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<p>[QUOTE=&quot;RickieB, post: 57107, member: 2486&quot;]Hello Ron..</p><p>&nbsp;As a general rule of thumb..&quot; do not clean your coins&quot;&nbsp; lemon juice is highly acidic and salt&nbsp; well if you look up Na on the periodic table you will see that it is a &quot;Alkali Metal&quot; and corrosive..with the acidic and corrosive properties of the mix no wonder&nbsp; the copper turned&nbsp; colors...best to leave them alone.</p><p>The Atomic Mass of Na (Sodium) is 22.99 g/mole...the lemon juice could be pH tested on litmus paper to determine its acidity..if the coins are just&nbsp; junk copper that you want to clean, I would suggest that a mild soultion diluted to ~ 10mmole/500ml might do a better job for you. But as mentioned.. its better not to clean em at all!</p><p><br /></p><p>RickieB <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie9" alt=":eek:" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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