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<p>[QUOTE=&quot;desertgem, post: 3107756, member: 15199&quot;]There is a vast difference in hardness of the outer nickel layer on such a coin compare to 90% silver 10% copper, also chemical reactivity , and other factors.&nbsp; What type of microscope did she use to compare surfaces? 30X stereomicroscope or even better a SEM? The naked eye can not detect such damage, but under magnification, even 10X , it can be seen if one knows what they are looking for. Jim[/QUOTE]</p><p><br /></p>

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