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					Originally Posted by kai
					
				 
				Hello David & Alan, 
 
from the pics, it looks like a grinding mark to me? 
 
Regards, 
Kai 
			
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 I thought that at first as well Kai, and that just might be, but it reacts really differently from the rest of the pamor and seems to be of a higher contrast material than the rest. As Alan points out, it does seem rather uncontrolled...