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<p>[QUOTE=&quot;rhoggman, post: 412591, member: 13987&quot;]Electrolysis works great. You don&#039;t need a car battery or anything either. Just a small AC/DC converter, and some simple supplies. This method will work wonders on copper, but you must be careful to not apply too big of a power source. Too much current (amps) will pockmark your coins. I usually find an old cell phone charger or something 12 - 18 Vdc and less than 1amp output(400-800 mA). </p><p><br /></p><p>You basically just attach one wire to something conductive, and the other end to the coin, make sure they are not touching, and dunk them in saltwater. If the coin bubbles you have the wires hooked up right.</p><p><br /></p><p>Too much salt will usually cause the AC/DC converter to sense a short, and many will shut off. You have to add a little salt at a time to make sure you have resistance in the water, otherwise electrolysis&nbsp; will not take place. </p><p><br /></p><p>I think this is great for copper coins with heavy oxidation. The oxidized copper will literally just fall off. </p><p><br /></p><p>Be aware this process does remove metal from the surface of the coin.... It is basically the same process as electroplating (in reverse).[/QUOTE]</p><p><br /></p>

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