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<p>[QUOTE=&quot;desertgem, post: 3593463, member: 15199&quot;]It seems to me that either way, if the core is bronze, it is plated outside of the mint whether it is aluminum or zinc over the bronze, and has no value as damaged. Zinc is several times more reactive to acid than aluminum is due to its oxidation protection. A drop of acid on the area ( with a faucet running in the sink) can help. Drop a drop of hydrochloric acid or vinegar if not available. The drop of HCL would show tiny bubbles on zinc and no effect on aluminum until many times longer. This&nbsp; would avoid the cost of XFR testing and even though a coin dealer will say his gold/silver checker can tell, they are not calibrated for the base metals. IMO. Jim</p><p><br /></p><p>I am 99+% sure it is zinc, see these experiments. When I have to teach&nbsp; a college chem class due to another teacher absence, These cents are in their lab drawers. </p><p><br /></p><p><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>[/QUOTE]</p><p><br /></p>

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