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<p>[QUOTE=&quot;V. Kurt Bellman, post: 3240101, member: 71723&quot;]What happens on early 60’s Jeff proofs, I AM TOLD BY SOMEONE WHO SHOULD KNOW, has nothing to do with thin film interference dichroism, but is due to excess trace elements in those metal batches themselves. Care to weigh in? I’m open minded about this sub-category.</p><p><br /></p><p>I had suspected subtle OGP plastics that were not consistent year to year.[/QUOTE]</p><p><br /></p>

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