I don't like sumatra blades that are stained the javanese way. 
would suggest to clean it gently and put on some oil to preserve it. 
Very nice blade , gracefull. 
 
Sorry Willem, 
 
I think that special Palembang blades need a staining, the result can be very good. And I am nearly sure that this blade will show a nice pamor. All my Palembang blades have a very nice pamor. Here some examples. Sorry about the poor pics. 
 
Detlef
		 
		
		
		
			
		
		
		
		
		
		
		
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