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			Join Date: Apr 2005 
				
				
				
					Posts: 3,255
				 
				
				
				
				
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			Hello Ariel, 
		
		
		
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 ![]() E. g. warangan results in a surface layer of arsenate. Have a close look at the pics! ![]() Regards, Kai  | 
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		#2 | 
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			Join Date: May 2006 
				
				
				
					Posts: 7,085
				 
				
				
				
				
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			Ariel, I've never used Nital, but I understand it is comprised of nitric acid and alchohol, as such, I would expect it to be a very good etchant, but I would not expect it to stain ferric material blue-black. Arsenic stains ferric material blue-black.
		 
		
		
		
		
		
		
		
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