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<p>[QUOTE=&quot;John Burgess, post: 8327692, member: 105098&quot;]because I&#039;m here...</p><p><br /></p><p>It&#039;s an improper alloying of the metals. metals are melted and combined to make an alloy.&nbsp; In the case of a lincoln cent, like the earlier years it was to be 95% Copper, 5% Tin and Zinc, this makes &quot;bronze&quot;, however, if the alloy isn&#039;t fully melted and mixed properly, you can get pure copper streaks, if the tin doesn&#039;t mix in well you might get streaks of Brass in the bronze, or if the zinc doesn&#039;t mix in well to the alloy you might get phosphor bronze streaks in the finish sheet. </p><p><br /></p><p>All of this is going to look the same when brand new metal, and as freshly minted coin,&nbsp; it will be close to alloyed properly and be a coppery cent color, but as the metal tones with time, the different metal compositions, the slight variation in the alloy not being mixed well enough, it tones at different rates making the streaks stand out.[/QUOTE]</p><p><br /></p>

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