Thanks for that Ariel, I've learnt something. 
 
I've never used tannic acid know nothing about it. 
 
As for vinegar, been using that stuff since I was little kid, like maybe 6 years old. True.It was one of my jobs as kid:- clean the saucepans. 
 
In fact what I use to clean keris blades these days is vinegar, since pineapple juice went bad in this country.
		 
		
		
		
		
		
		
		
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