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<p>[QUOTE=&quot;desertgem, post: 571396, member: 15199&quot;]The supposedly low number of brass plated cents would indicate that the % in erroneous composition was unnoticed until collectors started asking. The mint letter on Potter&#039;s site indicated that in the copper plating process, there were loose zinc planchet material in the plating solution so zinc alloyed with the copper to make brass. It doesn&#039;t take but microscopic amounts of zinc to change to the brass color. This should&nbsp; be a low occurrence situation as the solution should normally be cycled during the plating process.</p><p><br /></p><p>However, what interests me a little is that if the explanation is correct, the color of BU Brass cents should vary slightly in degree of yellow color, depending on the amount of zinc alloyed. Perhaps a paper to be written by someone. </p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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