Thanks all for sharing. 
 
I started to think now that my violin probably is also cover with shellac. At least the bow was as what I was told.  
 
Didn't realized things associated with finishing and chemical has so much studies in it.  
 
Anyway, I dislike shiny stuff and usually prefer matt kind of finish. I will follow Alan advice then.
		 
		
		
		
		
		
		
		
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