Yes, that's exactly how many of the blades in the exhibit looked like -- polished blades like stainless steel.  I guess they must been polished to make them look nice for the exposition and then kept all these years.  That's why they look that way. 
 
I also collect ivory santos and we know that 100 year-old ivory kept inside a glass virina can look new and without the yellowing we call patina.  I guess for 100 year-old kris pommels, the same thing can be expected.  Meaning they can look new if kept/stored all these years.
		 
		
		
		
		
		
		
		
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