What Kai has said is true Sid, realgar varies widely, precisely the reason that I use laboratory quality white arsenic. 
 
However, that said, staining a blade can be a very repetitive process. 
 
This keris is one I made, it took me two full days to get this stain on it, it was done in Sydney, in Summer, partially in shade, partially in full sun.
		 
		
		
		
			
		
		
		
		
		
		
		
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