Hello Detlef,
	Quote:
	
	
		| in my experience it's often the case that by one side the lamination come out better as by the other one. But the blade would benefit from a better and finer polish for sure. | 
	
 I can't remember this for barung blades (quality can be quite different on each side though). I agree that several rounds of polishing often do the trick.
Joren, I would not try to polish out deep scratches since this would mean removing a lot of metal. It's often enough to remove the light scratches for getting a nicer look. And don't use power tools... 
 
Regards,
Kai