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<p>[QUOTE=&quot;desertgem, post: 3400375, member: 15199&quot;]1957 cent is common as it was a key experiment in a nationwide push in 1957 to increase science education as Sputnik was twirling around the sky over the US and world &quot;beeping&quot; HaHa&quot;&nbsp; and the US population sure a bomb might be next.</p><p>Google:<span style="color: #b30000"> science education change in 1957</span></p><p><span style="color: #b30000"><br /></span></p><p><span style="color: #b30000"><span style="color: #000000">Our chem teacher went to the bank and got rolls of new 1957(D&nbsp; since my HS was in Calif) and the first new experiment was to make a silver or gold cent using simple chemicals and heat, it made a new start for several ( including myself who went on to teach chemistry and other sciences in college classes ( and still do part time),</span></span></p><p><br /></p><p><span style="color: #b30000"><span style="color: #000000"><a href="https://www.sciencecompany.com/Turn-Copper-Pennies-Into-Silver-and-Gold-Pennies.aspx" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.sciencecompany.com/Turn-Copper-Pennies-Into-Silver-and-Gold-Pennies.aspx" rel="nofollow">https://www.sciencecompany.com/Turn-Copper-Pennies-Into-Silver-and-Gold-Pennies.aspx</a></span></span></p><p><br /></p><p><span style="color: #b30000"><span style="color: #000000">Eventually though the cents went into gum machines, etc. but thousands done around the county and still a staple experiment in many chem labs from 7th grade to college chem. They can be done with any copper cent( or used to re-coat &#039;43 zinc cents) , but the largest group per date is probably the later 1950s.</span></span></p><p><br /></p><p><br /></p><p><span style="color: #b30000"><span style="color: #000000">Jim</span></span>[/QUOTE]</p><p><br /></p>

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