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<p>[QUOTE=&quot;2manybooks, post: 9446364, member: 8267&quot;]How long has it been since you removed it from the water, and has it changed during that time (eg. have bits fallen off)?</p><p><br /></p><p>I am still pondering the possibility that it has been shaped by a natural corrosion process. I can&#039;t think of a man-made technique that would produce the fine layering seen on the eroded portions (at least not at this scale, and in this sort of material). </p><p>[ATTACH=full]439160[/ATTACH]</p><p><br /></p><p>But there are corrosion processes that create accretions that build up with similar alternating layers as the microchemistry changes. The blue exterior would be the latest iteration of the process. </p><p><br /></p><p>If this hypothesis is correct, there must have been something protecting the copper wire that remains unaffected - perhaps something blocking access during most of its time in the water. Or, there may be a different piece of metal attached to the copper which has corroded preferentially, acting as what is called a &quot;sacrificial anode&quot;. (Apologies if I am too far into the weeds, here.)</p><p><br /></p><p>It would be interesting to x-ray the thing to see what might be inside.[/QUOTE]</p><p><br /></p>

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