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<p>[QUOTE=&quot;Goldsayshi463, post: 4768304, member: 111213&quot;]since most coins are made of alloys that have reactive metals like copper so that they slowly corrode away</p><p><b><u>reactive metals:&nbsp;&nbsp; Other metals used:</u></b></p><p>-copper&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; -nickel (can oxidize in a thin film but cant under oils like from&nbsp;&nbsp; </p><p>-tin&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; humans</p><p>-zinc</p><p>-silver (it tarnishes</p><p>to silver {II} oxide</p><p>which is is black)</p><p>~manganese (it</p><p>slowly oxidizes so</p><p><u>its a maybe)</u></p><p>Alloys make (a) certain metal(s) lower or higher the melting point and/or lower the oxidization rate. But most metals wont really react to oils, if they do it&#039;s at high temperature. They actually react to oxygen than get covered by people&#039;s dirty oils on their skin. Also its a low chance of a coin &quot;dying&quot; to corrosion. Pennies (type: Zincolns) have the highest chance of drying to corrosion.</p><p><br /></p><p>plz this took me hours of research.[/QUOTE]</p><p><br /></p>

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