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<p>[QUOTE=&quot;lordmarcovan, post: 2768769, member: 10461&quot;]That patina actually looks pretty nice on a WW2 zinc Nazi coin.</p><p><br /></p><p>I say leave it alone, but a mineral oil soak to remove surface grime should be safe enough to do without causing any harm, provided you&#039;re gentle when you wipe the oil off with a soft cloth or paper towel.&nbsp; I do not like olive oil.&nbsp; It is mildly acidic and leaves a sticky residue.&nbsp; In my experience, mineral oil is preferable and I actually like petroleum jelly (Vaseline), since it&#039;s less runny and messy for a dab on/wipe off application.</p><p><br /></p><p>And Vaseline or mineral oil might actually help preserve the coin in its original state, but would be less permanent than lacquer, which old-school collectors of yesteryear used.&nbsp; Lacquering is a no-no now.</p><p><br /></p><p>I would avoid any other kind of &quot;cleaning&quot;, by mechanical or chemical means.[/QUOTE]</p><p><br /></p>

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