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<p>[QUOTE=&quot;desertgem, post: 2123186, member: 15199&quot;]Generally, I do not think elevation ( I am assuming you mean the elevation of the devices or lettering) would play a part in most cases as the molecular movement of a toning/corrosive substance in air or liquid would not see much of a difference in elevation on a single coin , If it was contact with a corrosive substance, such as sulfur paper, felt, tannin acid components from contact with wood, etc., then it&nbsp; would contact the higher portions foremost. Some have used sulfur powder in vaseline or a certain Mexican acne ointment ( also with sulfur) for toning, If rubbed on with a finger, it looks very phony, but if smeared on a piece of paper or cardboard, and the coin is pressed down gently and slightly rotated can produce elevation chromatics. The timing is variable and mostly unpredictable, so they have to be very lucky to get any close results. I am always more suspicious of elevation coloring than progressive. However these are very unsophisticated methods.[/QUOTE]</p><p><br /></p>

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