I have a specific question - pls see attached pic. How does the empu get the black steel between the silver wengkon and the main silver pamor?  
 
Also, the black steel is of a different tone from the steel at the cutting edge. The black spots in the middle of the pamor are of that different black steel. Why is that so?
		 
		
		
		
			
		
		
		
		
		
		
		
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