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<p>[QUOTE=&quot;raider34, post: 866427, member: 16402&quot;]That is an interesting theory. I&#039;m not really sure how big of an effect that could have played though. Before 1901 the Mints used wood burning furnaces to anneal all the planchets (Which also give off sulfur), *in 1901 they switched to gas furnaces. So you would expect there to be a difference in toning between pre and post 1901 Morgans, but I don&#039;t believe that&#039;s the case. </p><p><br /></p><p>There are a bunch of theories, imo storage is probably one of the biggest factors. Wayne Miller, in his book <i>The Morgan and Peace dollar Textbook</i>, states there is some evidence that the acid bath given to the planchets after annealing was more concentrated for Peace dollars then it was for Morgan dollars, and this may have played a factor in deterring toning. </p><p><br /></p><p>Doug will come along soon and give us his drawings <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" />, I believe they took like this, /\/\/\/\/\/&nbsp; -Which I believe is a definite factor in the toning process.[/QUOTE]</p><p><br /></p>

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