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					Originally Posted by Battara
					
				 
				I don't know Detlef, I kind of agree with Wayne.  I have noticed that black oxidation is much more stable and have not had problems with it for years.   
 
Now there is a point, however, that in order to get a proper etch for a pattern, you do have to remove the black oxidation as well. 
			
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 Hi Jose,
It's chemistry, iron oxidation is always active, like said before, black oxidation isn't very fast but still active. It's different as aluminium oxidation which built a protection against further oxidation.
A proper etch of the blade could be worthwhile. 
Best regards,
Detlef