Before 5th edition made identifying a potion only take having a sip of it,
I thought this, too. But upon rereading my 1e DMG a few months ago I came across this on page 125 -
However, even a small taste should suffice to identify a potion in some way - even if just a slight urge.
 
				 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		