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<p>[QUOTE=&quot;desertgem, post: 3115326, member: 15199&quot;]Most tend to forget that mercury can amalgam with gold to form a whitish gray colorarion. Amalgams are different from acid reactions because gold and mercury ( 2 metals) interact with metallic bonding rather than the more common covalent or ionic bonding as metallic bonding shares electrons collectively as clouds rather than specific orbital bonding. Mercury is/ or rather was , a material that was very common, especially in schools, metallurgist, assayists, etc. as well as dentistry. Here is an article that talks about gold amalgams corrosion.</p><p><br /></p><p><a href="http://journals.sagepub.com/doi/abs/10.1177/00220345700490023401?journalCode=jdrb" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://journals.sagepub.com/doi/abs/10.1177/00220345700490023401?journalCode=jdrb" rel="nofollow">http://journals.sagepub.com/doi/abs/10.1177/00220345700490023401?journalCode=jdrb</a></p><p><br /></p><p>I have taken photos of the surface of morgan dollars to illustrate the differences in toning characteristics, but only in the range of 100-400X. I no longer have access to SEM, but if someone serious wanted to do higher resolution photos, this would be the way to go.</p><p><br /></p><p>Morgan on left, peace on rt. 100X</p><p><br /></p><p>[ATTACH=full]791377[/ATTACH]</p><p><br /></p><p>Then to show the higher peaks on the Morgan and the more acute angles to produce more light variations in toning , This is a 400X of a Morgan. I tried a 1000X, but the light and depth of field of the Light microscope was too little. thus someone needs to do studies with a SEM , but one can see the flow lines are not continuous or exactly parallel.</p><p><br /></p><p>.&nbsp;&nbsp; [ATTACH=full]791378[/ATTACH]</p><p><br /></p><p>Jim[/QUOTE]</p><p><br /></p>

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