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<p>[QUOTE=&quot;Info Sponge, post: 1000160, member: 20538&quot;]Not a metallurgist here, just someone who likes to ask questions.</p><p><br /></p><p>Given that annealing changes the hardness of the metal, could differently annealed planchets wind up with differently sized and shaped flow lines after being struck?</p><p><br /></p><p>Have I understood right from Doug&#039;s posts that flow lines affect toning (and that&#039;s why dipped coins re-tone in a way that&#039;s not the same as original toning)?</p><p><br /></p><p>So, whether annealing was the relevant variable or not, it&#039;s at least a possible hypothesis? A hypothesis disproven by rainbow toning on other coins that went through the same furnaces, but a possible one?[/QUOTE]</p><p><br /></p>

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