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<p>[QUOTE=&quot;brassnautilus, post: 2140020, member: 74300&quot;]Did David Sear ever explain how he came to the conclusion? Or which type of casting it was? Or was it something can only be seen under electronic microscope?</p><p><br /></p><p>On your second set of pictures, the couple &quot;holes&quot; looked rather round and had sharper &quot;walls&quot;. I&#039;m wondering if those were bubbles from casting, since evenly distributed surface tension from bubbles tend to create more rounded contours, and they might had looked different from those resulted from natural corrosion.</p><p><br /></p><p>I just wished he would explain his examination and verification process in better details so we could all learn something from the result, and not just the result itself.[/QUOTE]</p><p><br /></p>

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