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		 Nah....I think it is just paint from the saw insert. 
 
Still doing darters the old way, Frank.  If I had to do a lot I'd set up a jig to sand the slope, I suppose.  You could do it pretty easily on the drill press with a sanding drum and a same sized disc beneath it to act like a guide pin on a pin-router. 
		
		
		
		
		
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