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<p>[QUOTE=&quot;BadThad, post: 527172, member: 17261&quot;]Snaz has it right. Lincolns are made from 95% copper and 5% zinc and tin planchets. The pure copper parts of the imperfect planchet mix tone and oxidize at a different rate than the sections heavy with zinc and tin. </p><p>&nbsp;</p><p>The streaking occurs due to the rolling process in the planchet preparation. Very small bits of unmixed zinc and tin get rolled out like in dough. Think of what would happen if you put chocolate chips in dough and rolled it out as hard as you could in one direction.[/QUOTE]</p><p><br /></p>

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